Note 5 - Prepaid and Other Current Assets and Other Non-current Assets (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended			1 Months Ended		3 Months Ended		3 Months Ended	1 Months Ended				1 Months Ended			1 Months Ended				3 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended					6 Months Ended					1 Months Ended	3 Months Ended			6 Months Ended					1 Months Ended
	May 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Sep. 30, 2013 $40 Million Secured Debt Facility [Member]	May 31, 2013 Amended and Restated Secured Debt Facility [Member] $40 Million Secured Debt Facility [Member]	Sep. 30, 2013 Retirement of Debt [Member] Convertible Notes 2015 [Member]	Apr. 30, 2013 Retirement of Debt [Member] Convertible Notes 2015 [Member]	Sep. 30, 2013 Exchange of Debt [Member] Convertible Notes 2015 [Member]	Sep. 30, 2013 $40 Million Secured Debt Facility [Member] Remaining Unamortized Debt Issue Costs [Member]	May 31, 2013 $40 Million Secured Debt Facility [Member] Additions to Debt Issue Costs [Member]	May 31, 2013 $40 Million Secured Debt Facility [Member] Original Amount Debt Issue Costs [Member]	May 31, 2013 $40 Million Secured Debt Facility [Member] Debt Issue Costs Net [Member]	May 31, 2013 $40 Million Secured Debt Facility [Member]	Sep. 30, 2013 $40 Million Secured Debt Facility [Member]	Jan. 31, 2011 $40 Million Secured Debt Facility [Member]	May 31, 2013 $75 Million Secured Debt Facility [Member] Remaining Unamortized Debt Issue Costs [Member]	May 31, 2013 $75 Million Secured Debt Facility [Member]	May 31, 2012 $75 Million Secured Debt Facility [Member]	Jul. 31, 2011 $75 Million Secured Debt Facility [Member]	Sep. 30, 2013 Convertible Notes 2015 [Member] Remaining Unamortized Debt Issue Costs [Member]	Apr. 30, 2013 Convertible Notes 2015 [Member] Remaining Unamortized Debt Issue Costs [Member]	Mar. 31, 2010 Convertible Notes 2015 [Member] Amortized As Non-Cash Interest Expense [Member]	Apr. 30, 2014 Convertible Notes 2015 [Member]	Jun. 30, 2014 Convertible Notes 2015 [Member]		Sep. 30, 2013 Convertible Notes 2015 [Member]	Jun. 30, 2013 Convertible Notes 2015 [Member]	Mar. 31, 2010 Convertible Notes 2015 [Member]	Jun. 30, 2014 Convertible Notes 2015 [Member]		Jun. 30, 2013 Convertible Notes 2015 [Member]	Dec. 31, 2013 Convertible Notes 2015 [Member]		Apr. 30, 2014 Convertible Notes 2017 [Member]	Jun. 30, 2014 Convertible Notes 2017 [Member]		Sep. 30, 2013 Convertible Notes 2017 [Member]	Jun. 30, 2014 Convertible Notes 2017 [Member]		Dec. 31, 2013 Convertible Notes 2017 [Member]		Apr. 30, 2013 Convertible Notes 2017 [Member]	Apr. 30, 2013 Remaining Unamortized Debt Issue Costs [Member]
Note 5 - Prepaid and Other Current Assets and Other Non-current Assets (Details) [Line Items]
Debt Instrument, Face Amount								$ 40,000,000								$ 25,500,000	$ 40,000,000	$ 40,000,000		$ 75,000,000		$ 75,000,000
Repayments of Debt				0	46,139,000		36,000,000													25,500,000	40,000,000
Proceeds from Issuance of Debt	14,500,000															14,500,000
Gains (Losses) on Extinguishment of Debt		(1,245,000)	(3,786,000)	(1,245,000)	(3,786,000)							(1,700,000)							(1,400,000)							(300,000)			200,000								(900,000)									(300,000)
Payments of Debt Issuance Costs													1,800,000												4,800,000						6,100,000							300,000		2,300,000
Unamortized Debt Issuance Expense														600,000	2,400,000									600,000
Convertible Debt, Noncurrent																															170,900,000							168,700,000		143,800,000	168,700,000
Debt Instrument, Repurchased Face Amount																													85,000,000
Repayments of Convertible Debt									12,200,000		72,800,000																					63,783,000									218,901,000
Amortization of Financing Costs		344,000	740,000	718,000	1,418,000																		(100,000)				187,000			250,000		426,000		495,000				157,000			292,000
Convertible Debt										26,000,000																	58,169,000	[1]			170,900,000	58,169,000	[1]		81,523,000	[1]		152,787,000	[2]		152,787,000	[2]	125,416,000	[2]	25,000,000
Value Added Tax Receivable, Noncurrent		$ 2,036,000		$ 2,036,000		$ 1,772,000

[1] The Company estimated the fair value of the 2015 Convertible Notes to be approximately $60.7 million and $79.7 million at June 30, 2014 and December 31, 2013, respectively, based on observed market prices for the same or similar types of debt issues. The fair value of the 2015 Convertible Notes is considered to be a Level 1 measurement on the fair value hierarchy.

[2] The Company estimated the fair value of the 2017 Convertible Notes to be approximately $202.1 million and $130.1 million at June 30, 2014 and December 31, 2013, respectively, based on observed market prices for the same or similar types of debt issues. The fair value of the 2017 Convertible Notes is considered to be a Level 1 measurement on the fair value hierarchy.