Note 7 - Investment Securities - The Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Due in three months or less	$ 0
Due in three months or less	0
Due after three months through one year	336,717
Due after three months through one year	341,164
Due after one year through five years	3,537,316
Due after one year through five years	3,652,423
Due after five years through ten years	5,514,468
Due after five years through ten years	5,740,590
Due after ten years	8,910,907
Due after ten years	9,279,419
Residential mortgage-backed securities	24,763,845
Residential mortgage-backed securities	25,135,943
Securities available for sale, amortized cost	43,063,253
Securities available for sale	$ 44,149,539	$ 46,984,907