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Note 3 - Loss Per Share (Tables)
6 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
Series B preferred stock
   
59
     
59
 
Common stock warrants
   
6,080
     
6,080
 
Common stock options
   
4,651
     
3,917
 
Total potential dilutive securities
   
10,790
     
10,056