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Note 8 - Employee Benefit Plans - Fair Value of Plan Assets By Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair value of plan assets	$ 15,576	$ 27,252	$ 23,926
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	185	1,907
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	15,391	25,345
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	$ 0	$ 0

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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