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Note 6 - Retirement Plans (Details Textual)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 0.6
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 1.4 5.0
Defined Contribution Plan, Expected Contributions In Next Twelve Months   1.5
Minimum [Member]    
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 1.7 1.7
Maximum [Member]    
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 2.4 $ 2.4