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Note 5 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 8.0
Finite-Lived Intangible Asset, Useful Life 15 years  
Finite-Lived Intangible Assets, Remaining Amortization Period 15 years  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 0.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 0.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 0.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 0.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Four $ 0.9