Note 17 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Impaired loans	$ 3,807,000	$ 2,880,000
Foreclosed assets	0	701,000
Total	3,807,000	3,581,000
Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans	3,807,000	2,880,000
Foreclosed assets	0	701,000
Total	$ 3,087,000	$ 3,581,000