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Stockholders' Equity - Warrant activity (Details) - $ / shares
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Non-vested, Ending balance 50,000  
Exercisable 50,000  
Warrant    
Non-vested, Beginning balance 385,000 1,885,000
Exercised (190,000) (1,500,000)
Repurchased (100,000)  
Expired/Cancelled (45,000)  
Non-vested, Ending balance 50,000 385,000
Exercisable 50,000 385,000
Outstanding, Beginning balance Weighted Average Exercise Price $ 1.24 $ 1.25
Exercised Weighted Average Exercise Price 1.25 1.25
Repurchased 1.25  
Expired/Cancelled Weighted Average Expired Price 1.25  
Outstanding, Ending Balance Weighted Average Exercise Price 1.19 1.24
Exercisable, Weighted Average Exercise Price $ 1.19 $ 1.24