Note 6 - Inventories
 3 Months Ended
Jun. 30, 2021
Notes to Financial Statements  
Inventory Disclosure [Text Block]


NOTE 6. INVENTORIES
     Inventories are shown in the following table:

 

  

June 30,
2021

  

March 31,
2021

 

Raw materials

 $696,047  $660,678 

Work in process

  2,399,064   2,220,723 

Finished goods

  574,915   1,019,376 

Total inventories

 $3,670,026  $3,900,777