Note 11 - Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Loans	$ 1,338,000	$ 3,807,000
Foreclosed assets	0	0
Total	1,338,000	3,807,000
Fair Value, Inputs, Level 1 [Member]
Loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Loans	1,338,000	3,807,000
Foreclosed assets	0	0
Total	$ 1,338,000	$ 3,807,000