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Note 3 - Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Derivatives Measured at Fair Value on a Recurring Basis
  
(in thousands)
  
December 31,
  
Hedge derivatives
 
2016
(1)
  
 
2015
(1)
  
Net Fair Value of Derivative
(2)
   $
(4,293
 )   $
(28,434
 )
Quoted Prices in Active Markets (Level 1)
    
-
      
-
  
Significant Other Observable Inputs (Level 2)
   $
(4,293
 )   $
(28,434
 )
Significant Unobservable Inputs (Level 3)
    
-
      
-