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Note 11 - Retirement Fund and Profit Sharing Plan - Components of SERP Expense (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Service cost	$ 150	$ 144
Interest cost	159	185
Net amortization	86	48
Net periodic benefit cost	$ 395	$ 377

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
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X

- Definition

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

+ References

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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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