Note 2 - Investment Securities (Details) - Sales of Securities - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Sales of Securities [Abstract]
Proceeds from sales of securities	$ 11,922,915	$ 39,876,889	$ 65,889,838	$ 65,754,467
Pre-tax gross gains from sales of securities	102,766	357,934	672,317	379,130
Pre-tax gross losses from sales of securities	$ (46,186)	$ (338,505)	$ (198,804)	$ (338,505)