Note 13 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Fair Value of Company’s Fixed Rate Debt [Abstract]
$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		$ 153,479
$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	$ 138,460	[1]	$ 147,861	[1]

[1] The Company estimated the fair value of the $170.9 million 2015 Convertible Notes to be approximately $138.5 million and $147.9 million at June 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 $170.9 million 2015 Convertible Notes is considered to be a Level 1 measurement on the fair value hierarchy.