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Note 6 - Acquisition Related Intangible Assets, Net (Tables)
12 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]
   

2022

   

2021

 

Customer relationships

  $ 5,537,161     $ 5,537,161  

Less accumulated amortization

    (5,142,961

)

    (5,011,561

)

    $ 394,200     $ 525,600