Note 4 - Loans Receivable - Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Recorded investment		$ 6,702
Unpaid principal balance		7,176
Related allowance		150
Real Estate Loans [Member]
Recorded investment	$ 4,773
Business Assets [Member]
Recorded investment	3,857
Other Loans [Member]
Recorded investment	68
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member]
Recorded investment		483
Unpaid principal balance		585
Related allowance		0
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member] | Real Estate Loans [Member]
Recorded investment	411
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member] | Business Assets [Member]
Recorded investment	0
Residential Portfolio Segment [Member] | One-to-Four Family Loans [Member] | Other Loans [Member]
Recorded investment	0
Residential Portfolio Segment [Member] | One-to-Four Family Construction [Member]
Recorded investment		0
Unpaid principal balance		0
Related allowance		0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Recorded investment		3,614
Unpaid principal balance		3,697
Related allowance		0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Real Estate Loans [Member]
Recorded investment	39
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Business Assets [Member]
Recorded investment	628
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Other Loans [Member]
Recorded investment	0
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Recorded investment		754
Unpaid principal balance		866
Related allowance		0
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member] | Real Estate Loans [Member]
Recorded investment	4,164
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member] | Business Assets [Member]
Recorded investment	0
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member] | Other Loans [Member]
Recorded investment	0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Recorded investment		0
Unpaid principal balance		0
Related allowance		0
Home Equity Portfolio Segment [Member]
Recorded investment		107
Unpaid principal balance		133
Related allowance		0
Home Equity Portfolio Segment [Member] | Real Estate Loans [Member]
Recorded investment	159
Home Equity Portfolio Segment [Member] | Business Assets [Member]
Recorded investment	0
Home Equity Portfolio Segment [Member] | Other Loans [Member]
Recorded investment	0
Consumer Portfolio Segment [Member]
Recorded investment		25
Unpaid principal balance		30
Related allowance		0
Consumer Portfolio Segment [Member] | Real Estate Loans [Member]
Recorded investment	0
Consumer Portfolio Segment [Member] | Business Assets [Member]
Recorded investment
Consumer Portfolio Segment [Member] | Other Loans [Member]
Recorded investment	68
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Recorded investment		184
Unpaid principal balance		232
Related allowance		35
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Real Estate Loans [Member]
Recorded investment	0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Business Assets [Member]
Recorded investment	353
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Other Loans [Member]
Recorded investment	0
Commercial Portfolio Segment [Member] | Agricultural Loan [Member]
Recorded investment		1,535
Unpaid principal balance		1,633
Related allowance		$ 115
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Real Estate Loans [Member]
Recorded investment	0
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Business Assets [Member]
Recorded investment	2,876
Commercial Portfolio Segment [Member] | Agricultural Loan [Member] | Other Loans [Member]
Recorded investment	$ 0