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Stock-Based Compensation (Details Textual) (USD $)
0 Months Ended 3 Months Ended
Oct. 16, 2013
Mar. 31, 2015
Mar. 31, 2014
Stock Based Compensation [Abstract]      
Increase in number of common stock shares authorized 233,334us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized    
Percentage to retain annual restricted stock awards 50.00%sga_PercentageToRetainAnnualRestrictedStockAwards    
Stock options exercise price description   may not be exercised at a price which is less than 100% of the fair market value of shares at the date of grant.  
Stock options grant term   10 years  
Restricted stock [Member]      
Stock Based Compensation [Abstract]      
Stock-Based Compensation expense   462,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 188,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Recognized tax benefits   185,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 75,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Common Class A [Member] | Convert For Class B [Member]      
Stock Based Compensation [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 280,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_TypeOfArrangementAxis
= sga_ConvertForClassBMember
   
Common Class A [Member] | Stock Option [Member]      
Stock Based Compensation [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Common Class A [Member] | Incentive Compensation Plan [Member]      
Stock Based Compensation [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 620,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= sga_IncentiveCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Common Class B [Member] | Stock Option [Member]      
Stock Based Compensation [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 280,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember