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Note 8 - Employee Benefit Plans - Net Periodic Benefit Costs (Details) - Pension Plan And Supplemental Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest cost	$ 750	$ 578	$ 2,249	$ 1,735
Expected return on plan assets	(526)	(751)	(1,579)	(2,254)
Amortization of net actuarial (gains) losses	(36)	15	(106)	47
Net periodic pension (benefit) cost	$ 188	$ (158)	$ 564	$ (472)

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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