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Note 10 - Subsequent Event (Details) (Subsequent Event [Member], Presque Isle Acquisition [Member], USD $) In Millions, unless otherwise specified | Apr. 23, 2015
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Subsequent Event [Member] | Presque Isle Acquisition [Member] |
Note 10 - Subsequent Event (Details) [Line Items] |
Business Combination, Contingent Consideration, Liability | $ 10.25 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = gtn_PresqueIsleAcquisitionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Escrow Deposit | $ 1.0 us-gaap_EscrowDeposit / us-gaap_BusinessAcquisitionAxis = gtn_PresqueIsleAcquisitionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Details
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Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Balance Type: | debit
Period Type: | instant