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Note 9 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Contribution Plan, Cost	$ 0.1	$ 0.2
Defined Benefit Plan, Plan Assets, Contributions by Employer	0.2
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	0.7
Other Noncurrent Assets [Member]
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	$ 1.1

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

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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