Note 2 - Investment Securities (Details) - Sales of Securities - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Sales of Securities [Abstract]
Proceeds from sales of securities	$ 18,856,953	$ 54,966,923	$ 25,877,578
Pre-tax gross gains from sales of securities	$ 571	569,551	$ 21,196
Pre-tax gross losses from sales of securities		$ (152,618)