Note 6 - Net Income Per Share Computations - Reconciliation of Net Common Share Computation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Net income	$ 2,112,842	$ 10,563,249
Basic (in shares)	4,994,905	4,921,379
Plus dilutive effect of stock options (in shares)	37,305	27,803
Diluted (in shares)	5,032,210	4,949,182
Basic earnings per share (in dollars per share)	$ 0.42	$ 2.15
Diluted earnings per share (in dollars per share)	$ 0.42	$ 2.13