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Warrants (Tables)
12 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Schedule of all warrants
     Number of Warrants      Weighted Average Exercise Price      Weighted Average Remaining Contractual Life in Years  
Outstanding June 30, 2017     14,342     $ 1,005.80       4.23  
Warrants issued in connection with the August 2017 private offering     296,006     $ 72.00          
Warrants issued to underwriters in connection with the August 2017 private offering     19,749     $ 72.00          
Warrants issued in connection with the March 2018 public offering     1,533,356     $ 10.80          
Warrants issued to investor     100,000     $ 10.80          
Warrants expired     (42 )   $ 21,744.00          
Warrants exercised     (80,750 )   $ 8.20          
Outstanding June 30, 2018     1,882,661     $ 25.94       4.61  
Warrants issued in connection with the October 2018 public offering     10,120,000     $ 1.50          
Warrants issued to underwriters in connection with the October 2019 public offering     303,600     $ 1.50          
Warrants issued in connection with the Armistice debt exchange     4,403,409     $ 1.00          
Warrants exercised     (250,007 )   $ 1.50          
Outstanding June 30, 2019     16,459,663     $ 4.16       4.34