Note 13 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Income available to common stockholders									$ 13,597,967	$ 13,294,793
Weighted Average Shares of Common Stock Outstanding (in shares)									3,538,461	3,507,883
Net Income Per Common Share - Basic (in dollars per share)	$ 1.12	$ 0.95	$ 0.93	$ 0.85	$ 0.92	$ 0.8	$ 1.1	$ 0.97	$ 3.84	$ 3.79
Unvested Restricted Stock Awards (in shares)									14,547	18,953
Weighted Average Shares of Common Stock Outstanding - Diluted (in shares)									3,553,008	3,526,836
Income available to common stockholders									$ 13,597,967	$ 13,294,793
Net Income Per Common Share - Diluted (in dollars per share)	$ 1.11	$ 0.95	$ 0.92	$ 0.85	$ 0.91	$ 0.8	$ 1.09	$ 0.97	$ 3.83	$ 3.77