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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 | $ 720,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |  |  |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  |  |  |  |  |  | 87,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles | 100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles | 44,750 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles | 30,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles | 35,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles |
Proceeds from Sale of Intangible Assets |  |  | 1,640,000 us-gaap_ProceedsFromSaleOfIntangibleAssets | 0 us-gaap_ProceedsFromSaleOfIntangibleAssets | 0 us-gaap_ProceedsFromSaleOfIntangibleAssets |  |  |  |  |  |  |
Gain (Loss) on Disposition of Intangible Assets |  | 1,210,000 us-gaap_GainLossOnDispositionOfIntangibleAssets |  |  |  |  |  |  |  |  |  |
Michigan Network [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Intangible Assets |  |  |  |  |  | 1,640,000 us-gaap_ProceedsFromSaleOfIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = sga_MichiganNetworkMember |  |  |  |  |  |
Gain (Loss) on Disposition of Intangible Assets |  |  |  |  |  | 1,210,000 us-gaap_GainLossOnDispositionOfIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = sga_MichiganNetworkMember |  |  |  |  |  |
Intangible Assets, Net |  |  |  |  |  | 430,000 us-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 |  |  |  |  |  |  | 7,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = sga_BroadcastLicensesMember | 15,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = sga_BroadcastLicensesMember | 7,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = sga_BroadcastLicensesMember | 7,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = sga_BroadcastLicensesMember | 7,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = sga_BroadcastLicensesMember | 18,500 us-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 |  |  |  |  |  |  | $ 80,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | $ 85,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | $ 37,250 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | $ 22,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | $ 27,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember |

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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of gain (loss) on sale or disposal of intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7,9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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