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Note 8 - Derivative Instruments (Tables)
 6 Months Ended
Jun. 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 June 30,
    
For the Six Months
Ended June 30,
  
(in thousands)
  
2018
    
2017
    
2018
    
2017
  
Interest rate swap (CTI)
   $
-
     $
(5
 )   $
(5
 )   $
(18
 )
Metals swaps
    
101
      
(91
 )    
207
      
(77
 )
Embedded customer derivatives
    
(101
 )    
91
      
(207
 )    
77
  
Total loss
   $
-
     $
(5
 )   $
(5
 )   $
(18
 )