Note 18 - Salary Deferral Plans (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred Compensation Liability, Current and Noncurrent, Total	$ 1,575,000	$ 1,660,000
Deferred Compensation Arrangement with Individual, Compensation Expense	789,000	705,000	$ 575,000
Cash Surrender Value of Life Insurance	6,306,000	5,669,000
Life Settlement Contracts, Investment Method, Face Value, Total	16,377,000	15,497,000
Supplemental Employee Retirement Plan Agreement [Member]
Deferred Compensation Liability, Current and Noncurrent, Total	4,026,000	3,496,000
Cash Surrender Value of Life Insurance	51,701,000	40,536,000
Life Settlement Contracts, Investment Method, Face Value, Total	121,634,000	98,879,000
Flexible Indexed Annuity Contracts Value	$ 24,135,000	$ 23,861,000

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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Face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the investment method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=73718008&loc=d3e42674-111610

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