Note 3 - Summary of Significant Accounting Policies - Reconciliation of Net Income and Number of Shares Used in Computations of Basic and Diluted EPS (Details) - USD ($)	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Net Income	$ 503,000	$ 693,000	$ 1,522,000	$ 766,000	$ 1,671,000	$ 3,719,000	$ 2,215,000	$ 5,390,000	$ 2,718,000	$ 6,156,000	$ 3,282,000	$ 6,756,000
Shares (denominator):
Basic weighted average common shares outstanding (in shares)											12,713,533	13,225,628
Add: Dilutive effect of common stock options (in shares)											67,471	273,814
Diluted weighted average common shares outstanding (in shares)											12,781,004	13,499,442
Earnings per common share:
Basic earnings per common share (in dollars per share)											$ 0.26	$ 0.51
Diluted earnings per common share (in dollars per share)											$ 0.26	$ 0.50