Note 15 - Fair Value Measurements and Disclosures (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		Fair Value Measurements Using:
		Quoted		Significant
		Prices in		Other		Significant
		Active		Observable		Unobservable
	Balance Sheet	Markets		Inputs		Inputs
	Location	(Level 1)		(Level 2)		(Level 3)
		(in thousands)
December 31, 2014
Financial Liabilities
Derivative Financial Instruments
	Current Liabilities	$	-	$	-	$	-
	Non-current Liabilities		-		-		-
	Total	$	-	$	-	$	-
December 31, 2013
Financial Liabilities
Derivative Financial Instruments
	Current Liabilities	$	-	$	30	$	-
	Non-current Liabilities		-		-		-
	Total	$	-	$	30	$	-

Fair Value Measurements, Nonrecurring [Table Text Block]

	Fair Value Measurements Using:
	Quoted		Significant
	Prices in		Other		Significant
	Active		Observable		Unobservable
	Markets		Inputs		Inputs		Before-Tax
	(Level 1)		(Level 2)		(Level 3)(a)		Loss
	(in thousands)
For the Year Ended December 31, 2014
Long-lived assets held for use - Power plant and related equipment	$	-	$	-	$	32,801	$	58,000

Fair Value, by Balance Sheet Grouping [Table Text Block]

	December 31, 2014				December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in thousands)				(in thousands)
Convertible Notes, 8.5%, due October 2017, net of discount of ($13.9) million at December 31, 2014 and ($18.3) million at December 31, 2013 (1)	$	154,839	$	57,361	$	125,416	$	130,094
Convertible Notes, 6.5%, due March 2015, net of discount of ($0.4) million at December 31, 2014 and ($4.4) million at December 31, 2013 (2)		59,473		20,662		81,523		79,663