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Note 3 - Property and Equipment - Property and Equipment (Details) - USD ($)
Mar. 31, 2021
Jun. 30, 2020
Machinery and equipment $ 2,222,670 $ 2,222,670
Buildings and structures 401,470 401,470
Computers and office equipment 171,485 171,485
Total 2,795,625 2,795,625
Less accumulated depreciation (2,794,877) (2,794,257)
Net $ 748 $ 1,368