Note 2 - Recent Accounting Pronouncements (Details Textual) - USD ($)	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Retained Earnings (Accumulated Deficit)	$ 90,845,000		$ 88,465,000
Accrued Interest Receivable [Member]
Financing Receivable, Accrued Interest, after Allowance for Credit Loss	1,900,000
Unfunded Loan Commitment [Member]
Off-Balance-Sheet, Credit Loss, Liability	131,000
Debt Securities, Available-for-Sale [Member] | Accrued Interest Receivable [Member]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	2,200,000
Debt Securities, Available-for-Sale [Member] | Debt Securities, Held-to-Maturity [Member]
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss	$ 18,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss		$ 561,000
Retained Earnings (Accumulated Deficit)		(529,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Unfunded Loan Commitment [Member]
Off-Balance-Sheet, Credit Loss, Liability		$ 131,000