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Note 8 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plan, Cost Recognized $ 15.6 $ 14.7 $ 11.6
Deferred Compensation Liability, Current and Noncurrent 14.9 13.6  
Other Current Assets [Member] | Equity Securities [Member]      
Trading Securities $ 14.9 $ 13.6