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Acquisitions and Dispositions (Details Textual) (USD $)
1 Months Ended 0 Months Ended
Jan. 31, 2014
Dec. 02, 2014
Jun. 16, 2014
May 16, 2014
May 14, 2014
May 09, 2014
Feb. 28, 2014
May 05, 2015
Apr. 08, 2015
Nov. 04, 2014
Business Acquisition [Line Items]                    
Payments to acquire businesses gross $ 720,000us-gaap_PaymentsToAcquireBusinessesGross                  
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles     87,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles 100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles 44,750us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles 30,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles 35,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles      
Subsequent Event [Member]                    
Business Acquisition [Line Items]                    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest               1,335,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
9,640,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Michigan Network [Member]                    
Business Acquisition [Line Items]                    
Proceeds from Sale of Intangible Assets   1,640,000us-gaap_ProceedsFromSaleOfIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sga_MichiganNetworkMember
               
Intangible Assets, Net   430,000us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sga_MichiganNetworkMember
               
Gain (Loss) on Disposition of Intangible Assets   1,210,000us-gaap_GainLossOnDispositionOfIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sga_MichiganNetworkMember
               
Broadcast Licenses [Member]                    
Business Acquisition [Line Items]                    
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles     7,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= sga_BroadcastLicensesMember
15,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= sga_BroadcastLicensesMember
7,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= sga_BroadcastLicensesMember
7,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= sga_BroadcastLicensesMember
7,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= sga_BroadcastLicensesMember
    18,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= sga_BroadcastLicensesMember
Goodwill [Member]                    
Business Acquisition [Line Items]                    
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles     $ 80,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
$ 85,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
$ 37,250us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
$ 22,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
$ 27,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember