Note 13 - Fair Value Measurements and Disclosures (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

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

		Fair Value Measurements Using:
	Balance Sheet Location	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
		(in thousands)
June 30, 2013
Financial Liabilities
Derivative Financial Instruments
	Current Liabilities	$	-	$	358	$	-
	Non-current Liabilities		-		-		-
		$	-	$	358	$	-
December 31, 2012
Financial Liabilities
Derivative Financial Instruments
	Current Liabilities	$	-	$	2,984	$	-
	Non-current Liabilities		-		-		-
		$	-	$	2,984	$	-

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	June 30, 2013				December 31, 2012
	Carrying Amount		Fair Value (1)		Carrying Amount		Fair Value
	(in thousands)				(in thousands)
Short-term investments - U.S. Treasury bills	$	1,000	$	1,000	$	-	$	-

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

	June 30, 2013				December 31, 2012
	Carrying Amount		Fair Value (1)		Carrying Amount		Fair Value (1)
	(in thousands)				(in thousands)
$170.9 million Convertible Notes, 6.5%, due March 2015, net of discount of ($13.8) million at June 30, 2013 and ($17.4) million at December 31, 2012	$	157,132	$	138,460	$	153,479	$	147,861