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Note 14 - Retirement Plans (Details Textual) $ in Thousands	Mar. 31, 2020 USD ($)
Postretirement Health Coverage [Member]
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	$ 0

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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