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Note 2 - Other Assets (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Computer Software, Intangible Asset [Member]          
Amortization of Intangible Assets $ 800,000   $ 800,000 $ 2,500,000 $ 2,400,000
Finite-Lived Intangible Asset, Useful Life       15 years  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3,300,000     $ 3,300,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3,300,000     3,300,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,300,000     3,300,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,300,000     3,300,000  
Goodwill and Intangible Asset Impairment   $ 0      
Capitalized Computer Software, Net 36,500,000 38,500,000   36,500,000  
Capitalized Computer Software, Accumulated Amortization 12,600,000 10,300,000   12,600,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3,300,000     3,300,000  
Indefinite-Lived Franchise Rights $ 7,900,000 $ 7,000,000   $ 7,900,000