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Note 3 - Receivables (Tables)
12 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   

2022

   

2021

 

Accounts receivable

  $ 3,371,293     $ 5,375,598  

Allowance for doubtful accounts

    (206,093

)

    (234,963

)

    $ 3,165,200     $ 5,140,635