Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Unused Lines of Credit - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Unused lines of credit	$ 346,601,432	$ 346,550,159
Secured Debt [Member]
Line of Credit Facility [Line Items]
Unused lines of credit	14,601,432	17,050,159
Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Unused lines of credit	$ 332,000,000	$ 329,500,000