Note 19 - Parent Company Financial Information - Condensed Statements of Income (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net interest income	$ 8,416,000	$ 8,299,000	$ 8,100,000	$ 7,790,000	$ 7,728,000	$ 7,423,000	$ 7,190,000	$ 7,056,000	$ 32,605,336	$ 29,396,294	$ 26,427,020
Interest on junior subordinated notes									534,258	561,694	323,113
Income tax expense	775,000	948,000	664,000	574,000	484,000	610,000	486,000	257,000	2,961,139	1,837,329	1,349,009	[1]
Net income	$ 1,994,000	$ 1,894,000	$ 1,612,000	$ 1,461,000	$ 1,568,000	$ 1,237,000	$ 1,154,000	$ 725,000	6,961,262	4,683,213	4,089,622	[1],[2],[3]
Parent Company [Member]
Equity in earnings of subsidiary									7,448,666	5,099,001	4,347,843
Miscellaneous income									6,898	6,885	6,870
Net interest income									7,455,564	5,105,886	4,354,713
Interest on junior subordinated notes									534,258	561,695	323,113
Miscellaneous expenses									211,149	75,170	75,000
Income tax expense									(251,105)	(214,192)	(133,022)
Total expense									494,302	422,673	265,091
Net income									$ 6,961,262	$ 4,683,213	$ 4,089,622

[1] revised for prior period restatement

[2] revised for prior period restatement

[3] revised for prior period restatement