Note 9 - Goodwill and Other Intangibles - Activity for Goodwill and Other Intangible Assets (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill, beginning balance		$ 4,218,576	$ 4,218,576	$ 4,218,576	[1]
Total, beginning balance		6,114,090	6,401,485	4,226,436	[1]
Amortization, goodwill		0	0	0
Amortization, other intangibles		(284,327)	(287,395)	(7,860)
Acquisitions, goodwill		0	0	0	[2]
Acquisitions, other intangibles		0	0	2,182,909	[2]
Goodwill, ending balance		4,218,576	4,218,576	4,218,576
Total, ending balance		5,829,763	6,114,090	6,401,485
Core Deposits [Member]
Net book value, ending balance	[3]	1,895,514	2,182,909	7,860	[1]
Amortization, other intangibles	[3]	(284,327)	(287,395)	(7,860)
Acquisitions, other intangibles	[3]	0	0	2,182,909	[2]
Net book value, ending balance	[3]	$ 1,611,187	$ 1,895,514	$ 2,182,909

[1] CDI related to the acquisition of Green Street Financial Corp on November 30, 1999.

[2] CDI related to the acquisition of branch offices from Bank of America, N.A. on December 12, 2014.

[3] Includes the core deposit intangible (CDI), which is the only identifiable intangible asset subject to amortization at December 31, 2016, 2015 and 2014, respectively: