Note 10 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income	$ 1,745,458	$ 373,752
Weighted average shares of common stock outstanding - Basic (in shares)	2,755,265	2,911,057
Earnings Per Share - Basic (in dollars per share)	$ 0.63	$ 0.13
Warrants, Options and Convertible Notes (in shares)	423,155	358,796
Weighted average shares of common stock -Diluted (in shares)	3,178,420	3,269,853
Earnings Per Share - Diluted (in dollars per share)	$ 0.55	$ 0.11