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Note 5 - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
(in thousands)
               
Hedge derivatives
 
September 30, 2018
   
December 31, 2017
(1)
 
Net Fair Value of Derivatives
   
$2,055
     
$393
 
Quoted Prices in Active Markets (Level 1)
   
-
     
-
 
Significant Other Observable Inputs (Level 2)
   
$2,055
     
$393
 
Significant Unobservable Inputs (Level 3)
   
-
     
-
 
(in thousands)
               
Available-for-sale securities
 
September 30, 2018
   
December 31, 2017
 
Net Fair Value of Derivatives
   
$1,493
     
$-
 
Quoted Prices in Active Markets (Level 1)
   
$1,493
     
-
 
Significant Other Observable Inputs (Level 2)
   
-
     
-
 
Significant Unobservable Inputs (Level 3)
   
-
     
-