Note 19 - Condensed Parent Company Statements - Condensed Balance Sheets (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash	$ 37,406,930	$ 9,088,441	$ 18,774,419	$ 12,493,890
Available-for-sale securities	81,478,673	92,399,235
Deferred and receivable income taxes	1,727,174	3,474,135
Assets	794,459,520	687,979,819
Subordinated debentures	15,465,000	15,465,000
Common stock	687,850	687,550
Additional paid-in capital	50,856,069	50,552,077
Retained earnings, substantially restricted	60,679,308	57,347,282
Accumulated other comprehensive loss	(206,193)	(1,309,241)
Treasury stock	37,125,541	37,303,288
	794,459,520	687,979,819
Parent Company [Member]
Cash	713,996	1,571,915
Available-for-sale securities
Investment in subsidiary	89,319,774	83,946,411
Investment in Capital Trust I & II	465,000	465,000
Prepaid expenses and other assets	19,148	14,597
Deferred and receivable income taxes	469,020
Assets	90,986,938	85,997,923
Subordinated debentures	15,465,000	15,465,000
Accrued expenses and other liabilities	623,545	551,643
Due to subsidiary	6,900	6,900
Common stock	687,850	687,550
Additional paid-in capital	50,856,069	50,552,077
Retained earnings, substantially restricted	60,679,308	57,347,282
Accumulated other comprehensive loss	(206,193)	(1,309,241)
Treasury stock	(37,125,541)	(37,303,288)
	$ 90,986,938	$ 85,997,923