Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)

v2.4.1.9
Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $)
In Thousands, except Share data
Total
Additional Paid-In Capital
Retained Earnings
Total Stockholders' Equity
Non-controlling Interest
Class A Common Stock
Class B Common Stock
Balance at Dec. 31, 2013 $ 48,165us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 39,003us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,099us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 41,222us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
$ 6,943us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 75us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 45us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Balance, Shares at Dec. 31, 2013           7,523,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
4,465,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Distributions to partners (1,349)us-gaap_LimitedPartnersCapitalAccountDistributionAmount       (1,349)us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Redemptions of partners’ interests (240)us-gaap_PartnersCapitalAccountRedemptions       (240)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Redemptions of partners' interests, Shares             (17,000)us-gaap_PartnersCapitalAccountUnitsRedeemed
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Repayment of notes receivable from partners 629samg_NonControllingInterestIncreaseFromRepaymentOfNotesReceivableFromPartners       629samg_NonControllingInterestIncreaseFromRepaymentOfNotesReceivableFromPartners
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Equity-based compensation 1,159us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue     2us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,157us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  2us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Equity-based compensation, Shares             262,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Net Income 2,241us-gaap_ProfitLoss   944us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
944us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,297us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Accrued interest on notes receivable from partners (19)samg_AccruedInterestOnNotesReceivable       (19)samg_AccruedInterestOnNotesReceivable
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Dividends paid on Class A common stock (903)us-gaap_DividendsCommonStockCash   (903)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(903)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
     
Balance at Mar. 31, 2014 49,683us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 39,003us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,140us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
41,265us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
8,418us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
75us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
47us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Balance, Shares at Mar. 31, 2014           7,523,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
4,710,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Balance at Dec. 31, 2014 53,062us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 39,175us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
3,217us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
42,516us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
10,546us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
78us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
46us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Balance, Shares at Dec. 31, 2014           7,768,010us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
4,520,413us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Distributions to partners (1,241)us-gaap_LimitedPartnersCapitalAccountDistributionAmount       (1,241)us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Repayment of notes receivable from partners 481samg_NonControllingInterestIncreaseFromRepaymentOfNotesReceivableFromPartners       481samg_NonControllingInterestIncreaseFromRepaymentOfNotesReceivableFromPartners
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Equity-based compensation 389us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue       389us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Equity-based compensation, Shares             127,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Net Income 2,810us-gaap_ProfitLoss   1,403us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
1,403us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,407us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Deferred tax, net of amounts payable under tax receivable agreement 23samg_AdjustmentsToAdditionalPaidInCapitalDeferredTax 23samg_AdjustmentsToAdditionalPaidInCapitalDeferredTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  23samg_AdjustmentsToAdditionalPaidInCapitalDeferredTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
     
Accrued interest on notes receivable from partners (18)samg_AccruedInterestOnNotesReceivable       (18)samg_AccruedInterestOnNotesReceivable
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Share conversion, Value   57samg_StockIssuedDuringPeriodValueConversionOfConvertibleShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  56samg_StockIssuedDuringPeriodValueConversionOfConvertibleShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
(56)samg_StockIssuedDuringPeriodValueConversionOfConvertibleShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  (1)samg_StockIssuedDuringPeriodValueConversionOfConvertibleShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Share conversion, Shares           18,000samg_StockIssuedDuringPeriodSharesConversionOfConvertibleShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
(18,000)samg_StockIssuedDuringPeriodSharesConversionOfConvertibleShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Dividends paid on Class A common stock (932)us-gaap_DividendsCommonStockCash   (932)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(932)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
     
Balance at Mar. 31, 2015 $ 54,574us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 39,255us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 3,688us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 43,066us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
$ 11,508us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 78us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 45us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Balance, Shares at Mar. 31, 2015           7,786,010us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
4,629,029us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember