Note 12 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Federal:
Current	$ 588,767	$ 87,588
Deferred	819,734	366,026
	1,408,501	453,614
State:
Current	208,047	143,769
Deferred	(112,799)	2,411
	95,248	146,180
	$ 1,503,749	$ 599,794