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Note 7 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative contracts, net $ (1,187) $ (1,750)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity-method investment 34,009 $ 33,282
Fair Value, Inputs, Level 3 [Member] | Building and Building Improvements [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Long-lived assets held and used:    
Certain buildings and improvements $ 3,367