Note 12 - Disaggregated Net Revenues (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   

Fiscal Year Ended March 31,

 
   

2022

   

2021

 

Net Revenue in the US

               

Chemical

  $ 1,033,394     $ 977,422  

Electronics

    1,405,594       1,328,719  

Engineering

    481,422       517,550  
    $ 2,920,410     $ 2,823,691  
                 

Net Revenue outside the US

               

Chemical

  $ 286,184     $ 266,940  

Electronics

    -       -  

Engineering

    -       -  
    $ 286,184     $ 266,940  
                 

Total Revenues

  $ 3,206,594     $ 3,090,631