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Note 6 - Acquisition Related Intangible Assets, Net - Acquired Customer Relationships (Details) - Acquired Customer Relationships [Member] - USD ($)
Jun. 30, 2022
Jun. 30, 2021
Customer relationships $ 5,537,161 $ 5,537,161
Less accumulated amortization (5,142,961) (5,011,561)
Finite-Lived Intangible Assets, Net, Ending Balance $ 394,200 $ 525,600