Note 11 - Derivative Financial Instruments (Details) - Amount of Gain (Loss) on Derivative Instruments Recognized in Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amount of Gain (Loss) on Derivative Instruments Recognized in Income [Abstract]
Realized derivative gain (loss)	$ (497)	$ 0	$ (1,897)	$ 0
Unrealized derivative gain (loss)	1,774	8,407	2,626	2,039
Total gain (loss) on derivative financial instruments	$ 1,277	$ 8,407	$ 729	$ 2,039