Note 8 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Basic and diluted earnings per share calculation:
Net income to common stockholders	$ 58,352	$ 292,379	$ 985,374	$ 1,110,610
Weighted average number of common shares outstanding - basic (in shares)	4,601,110	4,575,068	4,592,638	4,575,068
Basic net income per share (in dollars per share)	$ 0.01	$ 0.06	$ 0.21	$ 0.24
Weighted average number of common shares outstanding - diluted (in shares)	4,676,672	4,622,938	4,657,538	4,621,840
Diluted net income per share (in dollars per share)	$ 0.01	$ 0.06	$ 0.21	$ 0.24