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Note 10 - Segment Information (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule Of Segment Reporting Information By Segment Statement Of Operations [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2017
    
2016
    
2017
    
2016
  
   
(in thousands)
  
Net sales:
                                
Water Transmission
   $
28,692
     $
39,775
     $
58,349
     $
69,133
  
Tubular Products
    
-
      
2,286
      
9
      
6,856
  
Total
   $
28,692
     $
42,061
     $
58,358
     $
75,989
  
                                 
Gross profit (loss):
                                
Water Transmission
   $
667
     $
(1,272
 )   $
1,832
     $
(7,022
 )
Tubular Products
    
(618
 )    
(890
 )    
(1,003
 )    
(577
 )
Total
   $
49
     $
(2,162
 )   $
829
     $
(7,599
 )
                                 
                                 
Operating loss:
                                
Water Transmission
   $
(438
 )   $
(2,648
 )   $
(1,352
 )   $
(9,904
 )
Tubular Products
    
(903
 )    
(1,002
 )    
(1,333
 )    
(898
 )
Corporate
    
(2,181
 )    
(2,603
 )    
(4,779
 )    
(5,487
 )
Total
   $
(3,522
 )   $
(6,253
 )   $
(7,464
 )   $
(16,289
 )