Note 18 - Salary Deferral Plans (Details Textual) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Deferred Compensation Liability, Current and Noncurrent, Total	$ 1,742,000	$ 1,786,000
Cash Surrender Value of Life Insurance	5,547,000	4,657,000
Life Settlement Contracts, Investment Method, Face Value, Total	15,499,000	13,526,000
Supplemental Employee Retirement Plan Agreement [Member]
Deferred Compensation Liability, Current and Noncurrent, Total	3,052,000	2,778,000
Cash Surrender Value of Life Insurance	29,650,000	27,105,000
Life Settlement Contracts, Investment Method, Face Value, Total	68,827,000	61,067,000
Flexible Indexed Annuity Contracts Value	$ 18,682,000	$ 14,471,000

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

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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 http://asc.fasb.org/extlink&oid=73718008&loc=d3e42674-111610

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Represents flexible index annuity contracts value.

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