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Note 8 - Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
    
For the Nine Months
Ended September 30,
  
(in thousands)
  
2018
    
2017
    
2018
    
2017
  
Interest rate swap (CTI)
   $
-
     $
(6
 )   $
(5
 )   $
(24
 )
Metals swaps
    
(221
 )    
156
      
14
      
79
  
Embedded customer derivatives
    
221
      
(156
 )    
(14
 )    
(79
 )
Total loss
   $
-
     $
(6
 )   $
(5
 )   $
(24
 )