Note 10 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Income	$ 1,831,479	$ 394,625	$ 3,576,937	$ 768,377
Weighted average shares of common stock outstanding - Basic (in shares)	2,755,916	2,721,832	2,755,764	2,880,070
Earnings Per Share - Basic (in dollars per share)	$ 0.66	$ 0.14	$ 1.30	$ 0.27
Warrants, Options and Convertible Notes (in shares)	456,882	354,244	440,387	356,520
Weighted average shares of common stock -Diluted (in shares)	3,212,798	3,076,076	3,196,151	3,236,590
Earnings Per Share - Diluted (in dollars per share)	$ 0.57	$ 0.13	$ 1.12	$ 0.24