Note 9 - Derivative Financial Instruments (Detail) - Fair Value of Derivative Instruments in Consolidated Balance Sheets (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Interest rate swap contracts	$ 3,919	$ 4,679
Accrued Liabilities [Member]
Interest rate swap contracts	1,351	1,839
Other Long-term Liabilities [Member]
Interest rate swap contracts	$ 2,568	$ 2,840