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Note 13 - Earnings Per Share (Details) (Stock Compensation Plan [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Stock Compensation Plan [Member]
   
Note 13 - Earnings Per Share (Details) [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 34,400us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
451,112us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weight-average Exercise Price $ 10.03sgc_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightAverageExercisePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
 
Investment Options, Exercise Price   $ 6.40invest_InvestmentOptionsExercisePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember