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Note 7 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Apr. 23, 2015 | Mar. 31, 2015
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Subsequent Event [Member] | Presque Isle Acquisition [Member] |  |
Note 7 - Commitments and Contingencies (Details) [Line Items] |  |
Business Combination, Contingent Consideration, Liability | $ 10.25 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = gtn_PresqueIsleAcquisitionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Twin Falls Acquisition [Member] |  |
Note 7 - Commitments and Contingencies (Details) [Line Items] |  |
Business Combination, Contingent Consideration, Liability |  | $ 17.50 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = gtn_TwinFallsAcquisitionMember

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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