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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
Sep. 30, 2021
Jun. 30, 2021
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total $ 984,155 $ 1,248,936
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent, Total $ 291,833 $ 408,925