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Employee Benefit Plans (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Benefit Plans [Line Items]      
Administrative expense $ 7,000us-gaap_DefinedContributionPlanAdministrativeExpenses $ 5,000us-gaap_DefinedContributionPlanAdministrativeExpenses $ 12,000us-gaap_DefinedContributionPlanAdministrativeExpenses
Discretionary contribution 260,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 240,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 230,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Deferred Compensation Expense Non Qualified Plan $ 123,000sga_DeferredCompensationExpenseNonQualifiedPlan $ 193,000sga_DeferredCompensationExpenseNonQualifiedPlan $ 126,000sga_DeferredCompensationExpenseNonQualifiedPlan