Note 9 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Income	$ 394,625	$ 941,523	$ 768,377	$ 1,154,663
Weighted average shares of common stock outstanding - Basic (in shares)	2,721,832	2,880,719	2,880,070	2,879,115
Earnings Per Share - Basic (in dollars per share)	$ 0.14	$ 0.33	$ 0.27	$ 0.40
Warrants, Options and Convertible Notes (in shares)	354,244	191,681	356,520	164,504
Weighted average shares of common stock -Diluted (in shares)	3,076,076	3,072,400	3,236,590	3,043,619
Earnings Per Share - Diluted (in dollars per share)	$ 0.13	$ 0.31	$ 0.24	$ 0.38