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Note 12 - Shareholders' Equity (Tables)
9 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Share-based Payment Award, Warrants, Valuation Assumptions [Table Text Block]
   
October 3,
 
   
2017
 
Grant date fair value
  $
0.2874
 
Options issued
   
250,000
 
Exercise price
  $
0.54
 
Expected term (in years)
   
3
 
Risk-free rate
   
1.62
%
Volatility
   
81.66
%
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
           
Weighted average
 
   
Warrants
   
exercise price
 
Outstanding as of June 30, 2017
   
-
    $
-
 
Warrants issued
   
250,000
    $
0.54
 
Outstanding as of March 31, 2018
   
250,000
    $
0.54
 
Schedule of Stockholders Equity Note Warrants or Rights By Exercise Price Range [Table Text Block]
Number of Warrants
   
Exercise Price¹
 
Expiration Date
250,000     $
0.54
 
October 2020