Note 2 - INVESTMENT SECURITIES (Details) $ in Thousands	9 Months Ended
Sep. 30, 2023 USD ($) item issuer security state	Dec. 31, 2022 USD ($) state issuer
Number of securities \| security	644
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions \| item	621
Aggregate losses of securities (as a percent)	17.10%
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year \| item	480
Gain on sale	$ 56
Number Of Charters Owning Municipal Securities \| item	4
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 989
General Obligation Bonds
Number of issuers \| issuer	81	118
Other investments	$ 80,400	$ 110,600
Number of states holding investments \| state	18	22
General Obligation Bonds \| Aggregate Fair Value Exceeding 5 Million
Number of states holding investments	7	7
General Obligation Bonds \| Aggregate Fair Value Exceeding 5 Million \| Minimum
Other investments	$ 5,000	$ 5,000
Revenue Bonds
Number of issuers \| issuer	166	181
Other investments	$ 593,200	$ 617,200
Number of states holding investments \| state	30	29
Revenue Bonds \| Aggregate Fair Value Exceeding 5 Million
Number of states holding investments \| state	14	12
Revenue Bonds \| Aggregate Fair Value Exceeding 5 Million \| Minimum
Other investments	$ 5,000	$ 5,000
Revenue Bonds \| Aggregate Book Or Market Value Exceeded 5% of The Company Equity [Member]
Number of issuers \| issuer	2	2
Percentage threshold	5.00%	5.00%
Other securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 989

The aggregate depreciation from amortized cost basis as a percent.

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The number of the company's that own the company's municipal securities.

+ References

No definition available.

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Number of issuers of debt securities.

+ References

No definition available.

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Number of securities.

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Represents the number of states investments are held in.

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No definition available.

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- Definition

Percentage threshold of stockholders' equity which general obligation or revenue bonds market value of any single issuer does not exceed.

+ References

No definition available.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-4

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(7)(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
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-Name Accounting Standards Codification
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-Paragraph 2
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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