Note 7 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Basic and diluted earnings per share calculation:
Net income to common stockholders	$ 971,489	$ 782,239
Weighted average number of common shares outstanding - basic (in shares)	4,603,556	4,576,669
Basic net income per share (in dollars per share)	$ 0.21	$ 0.17
Weighted average number of common shares outstanding - diluted (in shares)	4,645,831	4,617,073
Diluted net income per share (in dollars per share)	$ 0.21	$ 0.17