Note 9 - Derivative Financial Instruments (Details) - Fair Value of Derivative Instruments in Consolidated Balance Sheets (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 3,166	$ 4,679
Accounts Payable and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	1,217	1,839
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 1,949	$ 2,840