Note 20 - Condensed Parent Company Statements (Details) - Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash	$ 18,774,419	$ 12,493,890	$ 12,303,200	$ 41,663,405
Available-for-sale securities	97,292,487	86,467,985
Deferred income taxes	3,230,105	3,412,513
	652,835,072	628,459,644
Liabilities
Subordinated debentures	15,465,000	15,465,000
Stockholders' equity
Common stock	685,900	682,320
Additional paid-in capital	50,441,464	50,366,546
Retained earnings	53,258,126	48,549,691
Unrealized loss on available-for-sale securities, net	(683,956)	(448,421)
Treasury stock	(37,279,069)	(37,673,289)
	652,835,072	628,459,644
Parent Company [Member]
Assets
Cash	3,642,158	3,882,370
Available-for-sale securities	99,517	105,024
Investment in subsidiary	77,953,486	71,626,420
Investment in Capital Trust I & II	465,000	465,000
Prepaid expenses and other assets	13,894	15,954
Refundable income taxes	119,379	1,216,032
Deferred income taxes	9,985	7,947
	82,303,419	77,318,747
Liabilities
Subordinated debentures	15,465,000	15,465,000
Accrued expenses and other liabilities	409,054	370,000
Due to subsidiary	6,900	6,900
Stockholders' equity
Common stock	685,900	682,320
Additional paid-in capital	50,441,464	50,366,546
Retained earnings	53,258,126	48,549,691
Unrealized loss on available-for-sale securities, net	(683,956)	(448,421)
Treasury stock	(37,279,069)	(37,673,289)
	$ 82,303,419	$ 77,318,747