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Note 3 - Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
(in thousands)
  
December 31,
  
Hedge derivative
s
  
2017
(1)
    
2016
(1)
  
Net
Fair Value of Derivative
   $
393
     $
(4,293
 )
Quoted Prices in Active Markets (Level 1)
    
-
      
-
  
Significant Other Observable Inputs (Level 2)
   $
393
     $
(4,293
 )
Significant Unobservable Inputs (Level 3)
    
-
      
-