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Note 2 - Other Assets (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Other Assets [Member]      
Capitalized Computer Software, Net $ 35,400,000    
Indefinite-Lived Franchise Rights 7,000,000   $ 7,900,000
Computer Software, Intangible Asset [Member] | Depreciation and Amortization [Member]      
Amortization of Intangible Assets $ 800,000 $ 800,000  
Computer Software, Intangible Asset [Member]      
Finite-Lived Intangible Asset, Useful Life 15 years    
Finite-Lived Intangible Assets, Amortization Expense, Year Two $ 3,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,300,000    
Goodwill and Intangible Asset Impairment 0 $ 0 $ 0
Capitalized Computer Software, Accumulated Amortization 14,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 3,300,000