Note 13 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Mar. 31, 2010
Convertible Notes 2017 [Member]
Note 13 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt [Line Items]
Carrying Amount	$ 124,457	[1]		[1]
Fair Value	135,125	[1]		[1]
2015 Convertible Notes [Member]
Note 13 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt [Line Items]
Carrying Amount	80,655	[2]	153,479	[2]	136,300
Fair Value	$ 79,448	[2]	$ 147,861	[1],[2]

[1] The Company estimated the fair value of the 2017 Convertible Notes to be approximately $135.1 million and none at September 30, 2013 and December 31, 2012, 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.

[2] The Company estimated the fair value of the 2015 Convertible Notes to be approximately $79.4 million and $147.9 million at September 30, 2013 and December 31, 2012, 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.