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Note 5 - Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
(in thousands)
                
Hedge derivatives
  
March 31,
2017
  
December 31,
2016
Net Fair Value of Derivatives
(1)
   $
(5,885
 )   $
(4,293
 )
Quoted Prices in Active Markets (Level 1)
    
-
      
-
  
Significant Other Observable Inputs (Level 2)
   $
(5,885
 )   $
(4,293
 )
Significant Unobservable Inputs (Level 3)
    
-
      
-