Note 9 - Convertible Notes and Non-recourse Notes (Detail) - May 2015 Notes (USD $)	Mar. 31, 2012	Dec. 31, 2011
Net carrying value of the May 2015 Notes	$ 371,772,000	$ 409,985,000
Convertible May 2015 Notes [Member]
Principal amount of the May 2015 Notes	155,250,000	155,250,000
Unamortized discount of liability component	(15,208,000)	(16,298,000)
Net carrying value of the May 2015 Notes	$ 140,042,000	$ 138,952,000

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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