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Note 10 - Stock-based Compensation (Tables)
 6 Months Ended
Dec. 31, 2018
Notes Tables  
Nonvested Restricted Stock Shares Activity [Table Text Block]
   
Six Months Ended
December 31, 2018
  
   
Shares Under
Options
    
Weighted
Average Exercise
Price
  
Outstanding, June 30, 2018
    
35,625
     $
10.01
  
Granted
    
—
      
—
  
Exercised
    
35,625
     $
10.01
  
Forfeited
    
—
      
—
  
Outstanding, December 31, 2018
    
—
     $
—
  
Aggregate intrinsic value
   $
—
      
 
  
Exercisable, end of period
    
—
     $
—
  
Aggregate intrinsic value
   $
—
      
 
  
Available for grant, end of period
    
—