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Note 6 - Preferred Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Jul. 15, 2008
Dec. 31, 2012
Jun. 26, 2008
Note 6 - Preferred Stock (Details) [Line Items]      
Temporary Equity, Shares Issued (in Shares)     1,000us-gaap_TemporaryEquitySharesIssued
Stock Issue Discount, Fees, and Expenses $ 8.4gtn_StockIssueDiscountFeesAndExpenses    
Preferred Stock, Dividend Rate, Percentage   17.00%us-gaap_PreferredStockDividendRatePercentage  
Preferred Stock [Member]      
Note 6 - Preferred Stock (Details) [Line Items]      
Stock Repurchased and Retired During Period, Value   25.9us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
 
Payments of Dividends   16.7us-gaap_PaymentsOfDividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember