Note 2 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income	$ 3,040	$ 2,237	$ 2,436	$ 3,375	$ 1,934	$ 2,174	$ 7,713	$ 7,483
Preferred stock dividends	31			0			133	95
Net income available to common stockholders	$ 3,009			$ 3,375			$ 7,580	$ 7,388
Average common shares outstanding - basic (in shares)	2,735,212			2,721,212			2,735,212	2,721,212
Add: Dilutive effects of restricted stock awards (in shares)	32,850			27,367			28,973	23,170
Average shares and dilutive potential common shares (in shares)	2,768,062			2,748,579			2,764,185	2,744,382
Basic earnings per common share (in dollars per share)	$ 1.10			$ 1.24			$ 2.77	$ 2.72
Diluted earnings per common share (in dollars per share)	$ 1.09			$ 1.23			$ 2.74	$ 2.69