Note 17 - Condensed Parent Only Financial Statements - Statements of Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income before income tax expense	$ 2,317,773	$ 1,860,892
Income tax expense	1,503,749	599,794
Net income	814,024	1,261,098
Parent Company [Member]
Equity in net income of subsidiary	858,784	1,316,346
Interest income	74,504	31,537
Operating income	933,288	1,347,883
Other expenses	137,257	86,785
Income before income tax expense	796,031	1,261,098
Income tax expense	(17,993)
Net income	$ 814,024	$ 1,261,098