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Note H - Segment Information (Tables)
 9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
December 31,
    
Nine Months Ended
December 31,
  
   
201
9
    
201
8
    
201
9
    
201
8
  
Net sales
                                
Coil
   $
21,001
     $
28,731
     $
77,604
     $
94,688
  
Tubular
    
7,150
      
14,595
      
31,518
      
50,263
  
Total net sales
   $
28,151
     $
43,326
     $
109,122
     $
144,951
  
                                 
Operating profit (loss)
                                
Coil
   $
(93
 )   $
744
     $
575
     $
5,847
  
Tubular
    
(468
 )    
650
      
(1,670
 )    
4,348
  
Total operating profit (loss)
    
(561
 )    
1,394
      
(1,095
 )    
10,195
  
Corporate expenses
    
587
      
517
      
1,826
      
1,963
  
Interest expense
    
2
      
2
      
2
      
18
  
Interest & other income
    
(4
 )    
(6
 )    
(15
 )    
(75
 )
Total earnings (loss) before taxes
   $
(1,146
 )   $
881
     $
(2,908
 )   $
8,289
  
   
December 31, 201
9
    
March 31, 201
9
  
Segment assets
                
Coil
   $
35,272
     $
43,104
  
Tubular
    
26,354
      
31,520
  
     
61,626
      
74,624
  
Corporate assets
    
22,604
      
11,978
  
    $
84,230
     $
86,602