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Note 8 - Employee Benefit Plans - Change in Benefit Obligation (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Benefit obligation	$ (25,519)	$ (20,027)	$ (18,701)
Fair value of plan asset	23,926	21,114	$ 17,819
Net funded status	$ (1,593)	$ 1,087

X

- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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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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