Note 10 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Income			$ 1,694,868	$ 1,497,079	$ 5,271,805	$ 2,265,456
Weighted average shares of common stock outstanding - Basic (in shares)	2,850,958	2,720,654	2,850,958	2,720,654	2,787,845	2,826,347
Earnings Per Share - Basic (in dollars per share)	$ 0.59	$ 0.55	$ 0.59	$ 0.55	$ 1.89	$ 0.80
Warrants, Options and Convertible Notes (in shares)			398,275	371,866	435,159	360,599
Weighted average shares of common stock -Diluted (in shares)	3,249,233	3,092,520	3,249,233	3,092,520	3,223,004	3,186,946
Earnings Per Share - Diluted (in dollars per share)	$ 0.52	$ 0.48	$ 0.52	$ 0.48	$ 1.64	$ 0.71