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Note 1 - Basis of Presentation (Details Textual)	6 Months Ended
	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Number of Operating Segments	1
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 1,270,000
Minimum Principal Balance of Loans for Quarterly Rating Review	500,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss	8,910,000		$ 7,940,000
Off-Balance-Sheet, Credit Loss, Liability	964,000	$ 964,000	$ 1,196,000	$ 956,000	$ 776,000	$ 678,000
Other Liabilities [Member]
Off-Balance-Sheet, Credit Loss, Liability	$ 964,000

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Minimum amount of principal for loans to be reviewed that are deemed to be impaired.

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Amount, after allowance for credit loss, of accrued interest 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 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2A
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Amount, after allowance for credit loss, of accrued interest on financing receivable.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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