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Note 6 - Income Taxes (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   

Year Ended March 31

 
   

2022

   

2021

 

Current taxes

 

Federal

  $ 2,863,915     $ 2,600,670  

State

    140,822       75,852  

Deferred taxes

 

Federal

    (11,927

)

    (123,959

)

State

    (499

)

    (5,195

)

Income tax provision

  $ 2,992,312     $ 2,547,368  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   

Year Ended March 31

 
   

2022

   

2021

 

Tax expense at U.S. Statutory rate

  $ 3,674,961     $ 2,990,768  

State income taxes, net of Federal benefit

    136,144       88,909  

Research and development credits

    (42,688

)

    (86,223

)

Foreign-derived intangible income deduction

    (662,467

)

    (450,912

)

Other

    (113,638

)

    4,826  

Income tax provision

  $ 2,992,312     $ 2,547,368  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   

March 31

 
   

2022

   

2021

 

Paid time off accrual

  $ 63,055     $ 60,869  

Inventory reserve

    47,042       50,324  

Depreciation and amortization

    88,690       88,690  

Stock-based compensation deductions

    88,710       75,189  

Unrealized gain on marketable securities

    89,102       (308,403

)

Other

    106,870       106,869  

Deferred tax assets

  $ 483,469     $ 73,538