Note 9 - Short-term Borrowings - Short-term Borrowings (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Overnight repurchase agreements with customers	$ 8,131,387	$ 73,872,716
Federal funds purchased	31,840,000	70,790,000
	$ 39,971,387	$ 144,662,716