Note 6 - Fair Value Measurements - Impaired Loans and Other Real Estate Owned Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other real estate owned net of valuation allowance	$ 957	$ 957
Fair Value, Inputs, Level 1 [Member]
Other real estate owned net of valuation allowance	0	0
Fair Value, Inputs, Level 2 [Member]
Other real estate owned net of valuation allowance	0	0
Fair Value, Inputs, Level 3 [Member]
Other real estate owned net of valuation allowance	$ 957	$ 957