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Note 5 - Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
(in thousands)
                
Hedge derivative
s
 
September 30
, 2017
    
December 31, 2016
  
Net
Fair Value of Derivatives
(1)
   $
(2,344
 )   $
(4,293
 )
Quoted Prices in Active Markets (Level 1)
    
-
      
-
  
Significant Other Observable Inputs (Level 2)
   $
(2,344
 )   $
(4,293
 )
Significant Unobservable Inputs (Level 3)
    
-
      
-