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Note 10 - Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
   
Net Gain (Loss) Recognized
  
(in thousands)
  
2019
    
2018
    
2017
  
Fixed interest rate hedge
   $
(227
 )   $
-
     $
-
  
Interest rate swap (CTI)
    
-
      
(5
 )    
(31
 )
Metals swaps
    
291
      
(79
 )    
475
  
Embedded customer derivatives
    
(291
 )    
79
      
(475
 )
Total loss
   $
(227
 )   $
(5
 )   $
(31
 )