Note 2 - Investment Securities - Sales of Securities (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Proceeds from sales of securities*	[1]		$ 58,775,764	$ 11,922,915	$ 119,850,909	$ 65,889,838
Gain on Sale of Investments		$ 4,010,877	4,281,828	102,766	4,815,373	672,317
Pre-tax gross losses from sales of securities			$ (30,055)	$ (46,186)	$ (187,090)	$ (198,804)

[1] Proceeds from sales of securities for the nine months ended September 30, 2016 includes $32.1 million receivable from broker for the sale of securities