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Note 8 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Defined benefit pension plan	$ 10,397	$ 11,091
Less current portion	(165)	(165)
Non-current portion of accrued retirement benefits	10,232	10,926
Pension Plan [Member] | Qualified Plan [Member]
Defined benefit pension plan	8,112	8,790
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member]
Defined benefit pension plan	$ 2,285	$ 2,301

X

- Definition

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

+ References

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