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Note 8 - Employee Retirement Plans - Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Projected and accumulated benefit obligation	$ 84,308	$ 88,960	$ 91,654	$ 90,247
Fair value of plan assets	$ 56,779	$ 56,495	$ 59,625	$ 56,790

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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