Note 9 - Derivative Financial Instruments (Detail) - Summary of the effects of commodity derivative instruments on the condensed consolidated statements of operations and comprehensive income (loss): (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Increase (decrease) in fair value of derivatives included in other comprehensive income (effective portion)	$ 231	$ (223)
Realized gain (loss) included in cost of revenues (effective portion)	$ (66)	$ (111)