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Note 6 - Deferred Compensation and Long-term Incentive Plan (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Maximum [Member]    
Deferred Compensation Arrangement with Individual, Requisite Service Period 7 years  
Other Noncurrent Liabilities [Member]    
Deferred Compensation Liability, Classified, Noncurrent $ 21.1 $ 19.7
Other Noncurrent Assets [Member]    
Deferred Compensation Plan Assets $ 21.1 $ 15.4