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Note G - Segment Information (Tables)
 9 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
December 31,
    
Nine Months Ended
December 31,
  
   
201
7
    
2016
    
201
7
    
2016
  
Net sales
                                
Coil
   $
22,410
     $
13,495
     $
60,547
     $
47,945
  
Tubular
    
5,624
      
2,494
      
16,648
      
8,755
  
Total net sales
   $
28,034
     $
15,989
     $
77,195
     $
56,700
  
                                 
Operating profit (loss)
                                
Coil
   $
1,178
     $
538
     $
2,483
     $
(858
 )
Tubular
    
(53
 )    
(437
 )    
261
      
(1,360
 )
Total operating profit (loss)
    
1,125
      
101
      
2,744
      
(2,218
 )
Corporate expenses
    
463
      
487
      
1,405
      
1,475
  
Interest
& other income
    
(4
 )    
(15
 )    
(13
 )    
(44
 )
Total earnings (loss) before taxes
   $
666
     $
(371
 )   $
1,352
     $
(3,649
 )
   
December
31,
201
7
    
March
31,
201
7
  
Segment assets
                
Coil
   $
26,770
     $
21,833
  
Tubular
    
41,501
      
37,299
  
     
68,271
      
59,132
  
Corporate assets
    
3,676
      
4,131
  
    $
71,947
     $
63,263