Note 11 - Other Borrowings and Unused Lines of Credit - Other Borrowings (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Other borrowings	$ 72,032,318	$ 66,000,000
Revolving line of credit
Other borrowings	9,000,000
Wholesale structured repurchase agreements
Other borrowings	35,000,000	35,000,000
Term notes
Other borrowings	23,250,000	$ 31,000,000
Subordinated debentures
Other borrowings	$ 4,782,318