Note 14 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income available to common stockholders									$ 5,653,298	$ 5,839,387
Weighted Average Shares of Common Stock Outstanding (in shares)									3,405,061	3,319,731
Net Income Per Common Share - Basic (in dollars per share)	$ 0.02	$ 0.35	$ 0.37	$ 0.93	$ 0.63	$ 0.43	$ 0.07	$ 0.63	$ 1.66	$ 1.76
Options and warrants under convertible note (in shares)									0	822
Weighted Average Shares of Common Stock Outstanding - Diluted (in shares)									3,405,061	3,320,553
Income available to common stockholders									$ 5,653,298	$ 5,839,387
Net Income Per Common Share - Diluted (in dollars per share)	$ 0.02	$ 0.35	$ 0.37	$ 0.93	$ 0.63	$ 0.43	$ 0.07	$ 0.63	$ 1.66	$ 1.76