Note 11 - Fair Value Measurements - Carrying Amount and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Servicing Asset at Amortized Cost, Fair Value	$ 2,500	$ 5,000
Advance payments by borrowers for taxes	28,238	5,334
Reported Value Measurement [Member]
Cash and cash equivalents	62,293	46,642
Loans receivable	1,651,093	1,510,178
FHLB stock	23,414	17,357
Accrued interest receivable	7,021	5,725
Servicing Asset at Amortized Cost, Fair Value	1,985	3,444
Deposits	1,205,162	1,199,012
Advance payments by borrowers for taxes	28,238	5,334
Borrowings	587,917	386,784
Accrued interest payable	3,082	1,358
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	62,293	46,642
Loans receivable	1,499,165	1,403,429
FHLB stock	23,414	17,357
Accrued interest receivable	7,021	5,725
Servicing Asset at Amortized Cost, Fair Value	2,462	5,001
Deposits	1,203,809	1,194,559
Advance payments by borrowers for taxes	28,238	5,334
Borrowings	577,275	377,275
Accrued interest payable	3,082	1,358
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	62,293	46,642
Loans receivable	0	0
FHLB stock	23,414	17,357
Accrued interest receivable	7,021	5,725
Servicing Asset at Amortized Cost, Fair Value	0	0
Deposits	471,912	556,741
Advance payments by borrowers for taxes	28,238	5,334
Borrowings	0	0
Accrued interest payable	3,082	1,358
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Loans receivable	0	0
FHLB stock	0	0
Accrued interest receivable	0	0
Servicing Asset at Amortized Cost, Fair Value	0	0
Deposits	731,897	637,818
Advance payments by borrowers for taxes	0	0
Borrowings	577,275	377,275
Accrued interest payable	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Loans receivable	1,499,165	1,403,429
FHLB stock	0	0
Accrued interest receivable	0	0
Servicing Asset at Amortized Cost, Fair Value	2,462	5,001
Deposits	0	0
Advance payments by borrowers for taxes	0	0
Borrowings	0	0
Accrued interest payable	$ 0	$ 0