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Note 6 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Defined benefit pension plan	$ 2,754	$ 8,079
Less current portion	(142)	(142)
Non-current portion of accrued retirement benefits	2,612	7,937
Pension Plan [Member] | Qualified Plan [Member]
Defined benefit pension plan	1,023	5,932
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member]
Defined benefit pension plan	$ 1,731	$ 2,147

X

- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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