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Note 9 - Derivative Financial Instrument (Details) - Fair Value of Derivative Instruments in Consolidated Balance Sheets (Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Interest rate swap contracts $ 2,375 $ 2,900
Accounts Payable and Accrued Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Interest rate swap contracts 1,228 1,215
Other Noncurrent Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Interest rate swap contracts $ 1,147 $ 1,685