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Note 9 - Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
   
Net Gain (Loss) Recognized
 
   
For the Three Months Ended March 31,
 
(in thousands)
  
2019
    
2018
  
Fixed interest rate hedge
   $
(9
 )  
$
-
  
Interest rate swap (CTI)
    
-
      
(5
 )
Metals swaps
    
130
      
106
  
Embedded customer derivatives
    
(130
 )    
(106
 )
Total loss
   $
(9
 )   $
(5
 )