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Note 2 - Other Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Capitalized Computer Software, Accumulated Amortization $ 18,300   $ 18,300    
Goodwill and Intangible Asset Impairment 0 $ 0 0 $ 0  
Other Assets [Member]          
Indefinite-Lived Franchise Rights 7,000   7,000   $ 7,000
Computer Software, Intangible Asset [Member]          
Interest Costs Capitalized     $ 31,500    
Finite-Lived Intangible Asset, Useful Life     15 years    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3,400   $ 3,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3,400   3,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,400   3,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,400   3,400    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3,400   3,400    
Computer Software, Intangible Asset [Member] | Depreciation and Amortization [Member]          
Amortization of Intangible Assets $ 900 $ 800 $ 1,700 $ 1,700