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Note F - Segment Information (Tables)
 6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
September 30,
    
Six Months Ended
September 30,
  
   
201
7
    
201
6
    
201
7
    
201
6
  
Net sales
                                
Coil
   $
20,128
     $
15,451
     $
38,138
     $
34,450
  
Tubular
    
5,950
      
2,867
      
11,023
      
6,261
  
Total net sales
   $
26,078
     $
18,318
     $
49,161
     $
40,711
  
Operating profit (loss)
                                
Coil
   $
552
     $
118
     $
1,305
     $
(1,396
 )
Tubular
    
316
      
(649
 )    
314
      
(923
 )
Total operating profit (loss)
    
868
      
(531
 )    
1,619
      
(2,319
 )
Corporate expenses
    
415
      
431
      
942
      
988
  
Interest
& other income
    
(4
 )    
(15
 )    
(9
 )    
(29
 )
Total earnings (loss) before taxes
   $
457
     $
(947
 )   $
686
     $
(3,278
 )
   
September
30,
201
7
    
March
31,
201
7
  
Segment assets
                
Coil
   $
28,493
     $
21,833
  
Tubular
    
35,442
      
37,299
  
     
63,935
      
59,132
  
Corporate assets
    
5,435
      
4,131
  
    $
69,370
     $
63,263