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Note 10 - Stock-based Compensation (Tables)
 9 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Nine Months Ended
   
March 31, 2020
   
Shares Under Options
    
Weighted Average Exercise Price
  
Outstanding as of June 30, 2019  
—
    
 
  
Granted
(1)
  
100,000
   $
14.50
  
Exercised  
—
    
 
  
Forfeited  
—
    
 
  
Outstanding at the end of the period  
100,000
    
 
  
Aggregate intrinsic value $
—
    
 
  
Exercisable, end of the period  
—
    
 
  
Aggregate intrinsic value $
—
    
 
  
Available for grant, end of period            
Weighted average fair value per share of options granted during the period  $
7.42