Note 8 - Fair Value of Financial Instruments (Details) - Location of Gain or Loss on Interest Rate Derivatives Designated as Cash Flow Hedges (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Location of Gain or Loss on Interest Rate Derivatives Designated as Cash Flow Hedges [Abstract]
Amount of gain (loss) recognized in OCI on derivative	$ 5,739,808	$ (5,441,029)	$ 6,062,062	$ (5,046,565)
Amount of loss reclassified from accumulated OCI into interest	1,172,818	960,075	2,370,502	1,532,151
Amount of gain recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	$ 41,927	$ 37,947	$ 4,567	$ 12,296