Note 19 - Condensed Parent Company Statements - Statements of Comprehensive Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
NET INCOME	$ 5,157,664	$ 5,594,011	$ 5,716,767
Change in unrealized gain (loss) on investment securities available-for-sale, before income taxes	1,182,895	(799,869)	(186,775)
Comprehensive income (loss) of Bank	6,260,712	4,968,726	5,481,232
Parent Company [Member]
NET INCOME	5,157,664	5,594,011	5,716,767
Change in unrealized gain (loss) on investment securities available-for-sale, before income taxes		2,695	(5,507)
Income tax expense related to other items of comprehensive income		(997)	2,038
Other comprehensive income (loss)		3,692	(7,545)
Comprehensive income (loss) of Bank	1,103,048	(628,977)	(227,990)
TOTAL COMPREHENSIVE INCOME	$ 6,260,712	$ 4,968,726	$ 5,481,232