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Note 5 - Retirement Plans (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 0.6
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 1.7
Defined Contribution Plan, Employer Discretionary Contribution Amount 1.9
Defined Contribution Plan, Expected Contributions In Next Twelve Months $ 5.9