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Note 13 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 1.0	$ 1.8	$ 1.7
Defined Contribution Plan, Cost	$ 4.0	$ 6.3	$ 4.3

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

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