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Note 12 - Inventories (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

2021

   

2020

 
                 

Finished products

  $ 317,654     $ 351,251  

In process

    25,175       31,173  

Raw materials and supplies

    128,987       173,474  
      471,816       555,898  

Less excess of FIFO cost over LIFO cost

    128,672       144,267  

Total inventories

  $ 343,144     $ 411,631