Note 13 - Income Taxes (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   

2022

   

2021

 
                 

Net operating loss carry-forward

  $ 834,000     $ 644,000  

Research & development tax credit carry-forward

    426,000       355,000  

Allowance for doubtful accounts

    190,000       84,000  

Valuation allowance

    (1,323,000 )     -  

Other

    (2,000 )     (2,000

)

                 

Deferred tax asset, net

  $ 125,000     $ 1,081,000  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   

2022

   

2021

 
                 

Statutory federal income tax rate

    21 %     21 %

State Taxes, net of federal

    (1 %)     7 %

Valuation allowance

    (296 %)     0 %

Other

    67 %     (18 %)

Effective income tax rate

    (209 %)     10 %