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Note G - Segment Information (Tables)
 3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
THREE MONTHS ENDED
JUNE 30,
  
   
201
8
 
    
201
7
As Adjusted
  
Net sales
                
Coil
   $
31,129
     $
18,010
  
Tubular
    
17,064
      
5,073
  
Total net sales
   $
48,193
     $
23,083
  
Operating profit (loss)
                
Coil
   $
3,179
     $
1,033
  
Tubular
    
2,321
      
(1
 )
Total operating profit (loss)
    
5,500
      
1,032
  
Corporate expenses
    
800
      
527
  
Interest & other income
    
(63
 )    
(4
 )
Earnings (loss) before income taxes
   $
4,763
     $
509
  
   
June 30,
201
8
 
    
March 31,
201
8
As Adjusted
  
Segment assets
                
Coil
   $
45,895
     $
34,359
  
Tubular
    
46,435
      
43,010
  
     
92,330
      
77,369
  
Corporate assets
    
3,571
      
4,284
  
    $
95,901
     $
81,653