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Note D - Inventories (Tables)
6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September
30,
201
7
   
March
31,
201
7
 
Prime Coil Inventory
  $
14,073,367
    $
8,481,605
 
Non-Standard Coil Inventory
   
2,426,116
     
1,119,170
 
Tubular Raw Material
   
712,994
     
1,480,730
 
Tubular Finished Goods
   
22,930,689
     
23,837,045
 
    $
40,143,166
    $
34,918,550