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Note 8 - Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2020
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)
  
2020
    
2019
  
Fixed interest rate hedge
   $
(202
 )  
$
(9
)
Metals swaps
    
(112
 )    
130
  
Embedded customer derivatives
    
112
      
(130
 )
Total loss
   $
(202
 )   $
(9
 )