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Employee Benefit Plans (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Employee Benefit Plans [Line Items] |  |  |
Administrative expense | $ 5,000 | $ 12,000 | $ 16,000
Deferred Compensation Expense Non Qualified Plan | 193,000 | 126,000 | 141,000
Discretionary contribution | $ 240,000 | $ 230,000 |

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
- 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