Note 11 - Other Borrowings and Unused Lines of Credit - Wholesale Structured Repurchase Agreement Collateralized Investment Securities (Details) - Whole sale Repurchase Agreements [Member] - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Securities sold under repurchase agreements	$ 65,002,722	$ 52,119,731
Less: overcollateralized position	30,002,722	7,119,731
	35,000,000	45,000,000
US Government Agencies Debt Securities [Member]
Securities sold under repurchase agreements	3,474,555	20,798,703
Residential Mortgage Backed Securities [Member]
Securities sold under repurchase agreements	$ 61,528,167	$ 31,321,028