Note 14 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income available to common stockholders									$ 5,839,387	$ 6,979,863
Weighted Average Shares of Common Stock Outstanding (in shares)									3,319,731	2,849,239
Net Income Per Common Share - Basic (in dollars per share)	$ 0.63	$ 0.43	$ 0.07	$ 0.63	$ 0.58	$ 0.59	$ 0.66	$ 0.63	$ 1.76	$ 2.45
Options and warrants under convertible note (in shares)									822	428,618
Weighted Average Shares of Common Stock Outstanding - Diluted (in shares)									3,320,553	3,277,857
Income available to common stockholders									$ 5,839,387	$ 6,979,863
Net Income Per Common Share - Diluted (in dollars per share)	$ 0.63	$ 0.43	$ 0.07	$ 0.63	$ 0.51	$ 0.52	$ 0.57	$ 0.55	$ 1.76	$ 2.13