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Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Employee Benefit Plans [Line Items] |  |  |
Administrative expense | $ 2,300 | $ 7,000 | $ 5,000
Discretionary contribution | 250,000 | 260,000 | 240,000
Deferred Compensation Expense Non Qualified Plan | $ 138,000 | $ 123,000 | $ 193,000

X
- Definition The compensation expense recognized during the period pertaining to non qualified deferred compensation plan. + References No definition available. + Details
Name: | sga_DeferredCompensationExpenseNonQualifiedPlan
Namespace Prefix: | sga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | sga_EmployeeBenefitPlansLineItems
Namespace Prefix: | sga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of administrative expenses incurred by a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanAdministrativeExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration