Note 8 - Borrowings - Advances from FHLB (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Long-term advances	$ 80,000	$ 50,000
Overnight variable-rate advances	0	59,977
Subordinated debt	$ 39,280	$ 0
Within one year or less, weighted-average interest rate		0.00%
Within one year or less		$ 0
After one year through two years, weighted-average interest rate	1.54%	1.79%
After one year through two years	$ 15,000	$ 10,000
After two years through three years, weighted-average interest rate	1.47%	1.54%
After two years through three years	$ 15,000	$ 15,000
After three years through four years, weighted-average interest rate	1.42%	1.47%
After three years through four years	$ 25,000	$ 15,000
After four years through five years, weighted-average interest rate	1.55%	1.36%
After four years through five years	$ 15,000	$ 10,000
After five years, weighted-average interest rate	1.76%	0.00%
After five years	$ 10,000	$ 0
Weighted average interest rate	1.52%	1.53%
Amount	$ 80,000	$ 50,000
Subordinated Debt [Member]
Maximum outstanding at any month-end	40,000	0
Monthly average outstanding	$ 30,370	$ 0
Annual	3.96%	0.00%
Period End	3.01%	0.00%
Interest expense during the period	$ 1,203	$ 0
Federal Home Loan Bank, Short-term, Variable-rate Advances [Member]
Maximum outstanding at any month-end	40,000	100,021
Monthly average outstanding	$ 5,207	$ 54,548
Annual	0.30%	0.60%
Period End	0.31%	0.32%
Interest expense during the period	$ 6	$ 132
Federal Home Loan Bank, Long-term, Fixed-rate Advances [Member]
Maximum outstanding at any month-end	80,000	55,000
Monthly average outstanding	$ 52,500	$ 50,000
Annual	1.46%	1.75%
Period End	1.52%	1.53%
Interest expense during the period	$ 768	$ 920