Note 7 - Derivatives and Hedging Activities (Details) - Changes in Fair Values of Derivative Financial Instruments (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount of loss recognized in other comprehensive income, net of tax	$ 2,220,865	$ 5,230,784
Hedge Ineffectiveness [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income	341
Caplet Amortization [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income	560
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized loss at beginning of period, net of tax	(399,367)
Amount of loss recognized in other comprehensive income, net of tax	(238,571)
Unrealized loss at end of period	$ (637,037)