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Note 13 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 1.8	$ 1.7	$ 1.6
Defined Contribution Plan, Cost	$ 6.3	$ 4.3	$ 4.4

X

- Definition

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

+ References

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-Publisher FASB
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X

- Definition

Amount of cost for defined contribution plan.

+ References

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-Name Accounting Standards Codification
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-SubTopic 70
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