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Note G - Segment Information (Tables)
 6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
September 30,
    
Six Months Ended
September 30,
  
   
2019
    
2018
    
2019
    
2018
  
Net sales
                                
Coil
   $
28,421
     $
34,828
     $
56,602
     $
65,957
  
Tubular
    
11,575
      
18,604
      
24,369
      
35,668
  
Total net sales
   $
39,996
     $
53,432
     $
80,971
     $
101,625
  
Operating profit (loss)
                                
Coil
   $
324
     $
1,925
     $
668
     $
5,103
  
Tubular
    
(1,746
 )    
1,376
      
(1,201
 )    
3,698
  
Total operating profit (loss)
    
(1,422
 )    
3,301
      
(533
 )    
8,801
  
Corporate expenses
    
614
      
661
      
1,241
      
1,462
  
Interest & other income
    
(4
 )    
(6
 )    
(11
 )    
(69
 )
Total earnings (loss) before taxes
   $
(2,032
 )   $
2,646
     $
(1,763
 )   $
7,408
  
   
September 30,
2019
    
March 31,
2019
  
Segment assets
                
Coil
   $
34,633
     $
43,104
  
Tubular
    
27,371
      
31,520
  
     
62,004
      
74,624
  
Corporate assets
    
19,924
      
11,978
  
    $
81,928
     $
86,602