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Stockholders' Equity - Warrants outstanding and exercisable (Details)
12 Months Ended
Jun. 30, 2020
$ / shares
shares
Warrants Outstanding 385,000
Warrants Exercisable 385,000
Range One [Member]  
Warrant Exercise Price | $ / shares $ 1.19
Warrants Outstanding 50,000
Warrants Outstanding Remaining Contractual Life (in years) 1 year 5 months 23 days
Warrants Exercisable 50,000
Range Two [Member]  
Warrant Exercise Price | $ / shares $ 1.25
Warrants Outstanding 335,000
Warrants Outstanding Remaining Contractual Life (in years) 10 months 21 days
Warrants Exercisable 335,000