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Note 13 - Warrants (Tables)
6 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Warrant and Rights Assumptions [Table Text Block]
   
Warrants Issued Three Months Ended December 31, 2020
 
Expected volatility
   
100
%
Equivalent term (years)
   
5.0
 
Risk-free rate
   
37
%
Dividend yield
   
0.00
%
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Number of Warrants
   
Weighted Average Exercise Price
   
Weighted Average Remaining Contractual Life in Years
 
Outstanding June 30, 2020
   
2,288,528
    $
30.26
     
2.00
 
Warrants issued
   
403,760
     
 
     
 
 
Warrants expired
   
(842
)    
 
     
 
 
Warrants exercised
   
-
     
 
     
 
 
Outstanding December 31, 2020
   
2,691,446
    $
26.94
     
1.65