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Note 13 - Retirement, Savings and Deferred Compensation Plans - Components of SERP Expense (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Service cost	$ 92	$ 126	$ 277	$ 377
Interest cost	221	159	664	477
Net amortization	18	78	53	234
Net periodic benefit cost	$ 331	$ 363	$ 994	$ 1,088

X

- Definition

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

+ References

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X

- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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X

- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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X

- Definition

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

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