Note 10 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Income	$ 228,837	$ 1,831,479	$ 2,304,407	$ 3,576,937
Weighted average shares of common stock outstanding - Basic (in shares)	3,317,665	2,755,916	3,314,573	2,755,764
Earnings Per Share - Basic (in dollars per share)	$ 0.07	$ 0.66	$ 0.70	$ 1.30
Warrants, Options and Convertible Notes (in shares)	1,599	456,882	1,644	440,387
Weighted average shares of common stock -Diluted (in shares)	3,319,264	3,212,798	3,316,217	3,196,151
Earnings Per Share - Diluted (in dollars per share)	$ 0.07	$ 0.57	$ 0.69	$ 1.12