Note 6 - Net Income Per Share Computations - Reconciliation of Net Common Share Computation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 7,512,946	$ 11,798,153
Basic (in shares)	4,854,339	4,776,007
Plus dilutive effect of stock options (in shares)	38,261	51,754
Weighted Average Diluted Shares (in shares)	4,892,600	4,827,761
Basic earnings per share (in dollars per share)	$ 1.55	$ 2.47
Diluted earnings per share (in dollars per share)	$ 1.54	$ 2.44