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Note 6 - Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2018
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)
  
2018
    
2017
  
Interest rate swap (CTI)
   $
(5
 )   $
(13
 )
Metals swaps
    
106
      
14
  
Embedded customer derivatives
    
(106
 )    
(14
 )
Total loss
   $
(5
 )   $
(13
 )