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Acquisitions and Dispositions (Details Textual) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Jan. 31, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 02, 2014
Jun. 16, 2014
May 16, 2014
May 14, 2014
May 09, 2014
Feb. 28, 2014
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  
Proceeds from Sale of Intangible Assets     1,640,000us-gaap_ProceedsFromSaleOfIntangibleAssets 0us-gaap_ProceedsFromSaleOfIntangibleAssets 0us-gaap_ProceedsFromSaleOfIntangibleAssets              
Gain (Loss) on Disposition of Intangible Assets   1,210,000us-gaap_GainLossOnDispositionOfIntangibleAssets                    
Michigan Network [Member]                        
Business Acquisition [Line Items]                        
Proceeds from Sale of Intangible Assets           1,640,000us-gaap_ProceedsFromSaleOfIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sga_MichiganNetworkMember
           
Gain (Loss) on Disposition of Intangible Assets           1,210,000us-gaap_GainLossOnDispositionOfIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sga_MichiganNetworkMember
           
Intangible Assets, Net           430,000us-gaap_IntangibleAssetsNetExcludingGoodwill
/ 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