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Note 5 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
(in thousands)
               
Hedge derivatives
 
March 31,
2018
   
December 31,
2017
(1)
 
Net Fair Value of Derivatives
  $
1,340
    $
393
 
Quoted Prices in Active Markets (Level 1)
   
-
     
-
 
Significant Other Observable Inputs (Level 2)
  $
1,340
    $
393
 
Significant Unobservable Inputs (Level 3)
   
-
     
-