Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2023 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 2,900,000
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss	788,000
Impairment of Long-Lived Assets to be Disposed of	0	$ 433,000
Advertising Expense	$ 980,000	988,000
Number of Reportable Segments	1
Financing Receivable, Allowance for Credit Loss	$ 12,569,000	11,178,000		$ 11,087,000
Off-Balance-Sheet, Credit Loss, Liability	161,300,000	1,214,000
Retained Earnings (Accumulated Deficit)	$ 111,054,000	104,129,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss		$ 784,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss			$ 784,000
Off-Balance-Sheet, Credit Loss, Liability			1,200,000
Retained Earnings (Accumulated Deficit)			$ 1,600,000
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	40 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Accrued Interest Receivable [Member]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 2,900,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss	$ 788,000