Note 4 - Derivatives and Hedging Activities (Details) - Changes in Fair Values of Derivative Financial Instruments - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount of income (loss) recognized in other comprehensive income, net of tax	$ 2,256,483	$ (812,175)	$ 2,098,427	$ 8,894,623
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized loss at beginning of period, net of tax	(574,311)	(251,149)	(399,367)
Amount of income (loss) recognized in other comprehensive income, net of tax	(292,591)	109,692	(477,998)	(141,457)
Unrealized loss at end of period	(846,803)	(152,425)	(846,803)	(152,425)
Hedge Ineffectiveness [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from AOCI to noninterest income related to hedge ineffectiveness	15,561	(10,968)	23,658	(10,968)
Amount reclassified from AOCI to interest expense related to caplet amortization	15,561	$ (10,968)	23,658	$ (10,968)
Caplet Amortization [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from AOCI to noninterest income related to hedge ineffectiveness	4,538		6,904
Amount reclassified from AOCI to interest expense related to caplet amortization	$ 4,538		$ 6,904