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Related Party Transactions (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2013 | Feb. 28, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2003
Related Party Transaction [Line Items] |  |  |  |  |  |
CEO Employment Agreement |  |  | In June2011, we entered into a new employment agreement with Edward K. Christian, Chairman, President and CEO, which became effective as of June1, 2011, and replaces and supersedes his prior employment agreement. The new employment agreement terminates on March31, 2018. The agreement provides for an annual base salary of $860,000 (subject to annual increases on each anniversary date not less than the greater of 3 % or a defined cost of living increase). Mr.Christian may defer any or all of his annual salary. |  |  |
Deferred Compensation Details |  |  | On December 27, 2012, Mr. Christian agreed to defer approximately $100,000 of his 2013 salary to be paid 100% on January 10, 2014. On December 16, 2013, Mr. Christian agreed to defer approximately $100,000 of his 2014 salary to be paid 100% on January 16, 2015. On December 2, 2014, Mr. Christian agreed to defer approximately $100,000 of his 2015 salary to be paid 100% on January 8, 2016. |  |  |
Option Agreement For Kfjx |  |  | $ 1,200,000 sga_OptionAgreementForKfjx |  |  |
Proceeds From Sale Of Vehicle | 41,000 sga_ProceedsFromSaleOfVehicle | 38,000 sga_ProceedsFromSaleOfVehicle |  |  |  |
Ceo [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Average Annual Compensation |  |  | 1,460,000 sga_AverageAnnualCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_CeoMember |  |  |
Surtsey Productions Inc [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Proceeds from Rents Received |  |  | 6,000 us-gaap_ProceedsFromRentsReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyProductionsIncMember | 6,000 us-gaap_ProceedsFromRentsReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyProductionsIncMember | 10,000 us-gaap_ProceedsFromRentsReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyProductionsIncMember |
Surtsey Media [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Tba Fees Kvct |  |  | 3,600 sga_TbaFeesKcvt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember | 3,400 sga_TbaFeesKcvt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember | 3,100 sga_TbaFeesKcvt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember |
Extension Fee Paid |  |  | 27,950 sga_ExtensionFeePaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember |  |  |
Debt Guaranteed Related Party |  |  |  |  |  | 1,250,000 sga_DebtGuaranteedRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember
Debt guaranteed and outstanding |  |  | 1,078,000 sga_RelatedPartyDebtGuaranteedAndOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember |  |  |
Intangible Assets Kfjxtv | 1,000,000 sga_IntangibleAssetsKfjxtv / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember |  |  | 1,000,000 sga_IntangibleAssetsKfjxtv / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember |  |
Station Agreement Fees Kfjx |  |  | 4,800 sga_StationAgreementFeesKfjx / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember | 4,500 sga_StationAgreementFeesKfjx / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember | 4,100 sga_StationAgreementFeesKfjx / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember |
Extended Term Of Agreement |  |  | Jun. 01, 2013 |  |  |
Extension fees paid, KFJX |  |  | $ 37,050 us-gaap_FeesAndCommissionsOther / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = sga_SurtseyMediaMember |  |  |

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