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Note 3 - Income Taxes (Tables)
12 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

September 30,

  

September 30,

 
  

2021

  

2020

 

Current:

        

Federal

 $5,154,287  $1,966,491 

State

  439,944   175,201 

Current income tax expense

  5,594,231   2,141,692 

Deferred:

        

Federal

  (234,297)  (252,929)

State

  46,947   (26,879)

Deferred income tax expense

  (187,350)  (279,808)

Income tax expense

 $5,406,881  $1,861,884 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

September 30,

  

September 30,

 
  

2021

  

2020

 

Federal statutory rate

  21.0%  21.0%

State income taxes

  2.2%  2.0%

Permanent differences:

        

Change in valuation allowance

  -   (0.5%)

Expiration and utilization of state NOL’s

  -   0.4%

Research and development credits

  (0.7%)  (2.5%)

Excess tax expense (benefits) from stock-based compensation

  (1.5%)  (0.1%)

Tax rate

  21.0%  20.3%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

September 30,

  

September 30,

 
  

2021

  

2020

 

Deferred income tax assets (liabilities):

        

Intangibles

 $(91,924) $(86,319)

Property and equipment depreciation

  (379,572)  (419,896)

Net operating loss carry forwards and credits

  300,032   351,446 

Stock-based compensation

  230,553   169,730 

Inventories

  518,526   386,296 

Prepaid expenses

  (48,505)  (43,233)

Accrued expenses and reserves

  519,408   467,010 

Goodwill

  (683,051)  (646,916)

Gross deferred tax asset (liability)

  365,467   178,118 

Valuation allowance

  -   - 

Net deferred tax asset (liability)

 $365,467  $178,118 
Summary of Valuation Allowance [Table Text Block]

Year Ended

 

Balance at Beginning of Year

  

Income Tax Benefit

  

Reversal for State NOL Expiration and Utilization

  

Balance at End of Year

 

September 30, 2021

 $-  $-  $-  $- 

September 30, 2020

 $47,014  $(5,235) $(41,779) $-