Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020
Number Of Limited Partnerships In Housing Investments			10
Percentage of Subsidiaries Common Securities Owned by Parent Company			100.00%
Gross Loans Comprised of Commercial Mortgage Loans Percentage	48.20%
Residential Mortgages Properties Percentage	28.80%
Gross Loans Comprised of Commercial Loans Percentage	18.20%
Federal Home Loan Bank Stock | $	$ 17,250	$ 17,250
Federal Home Loan Bank Stock Shares (in shares) | shares	172,500
Minimum Stock Requirement on Outstanding Federal Home Loan Bank Borrowings Shares (in shares) | shares	150,000
Variable Interest Entity, Primary Beneficiary, Number of Entities	10
Goodwill, Impairment Loss | $	$ 0	$ 0
Number of Reportable Segments	1
California [Member]
Residential Mortgages Properties Percentage	47.30%