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Note 10 - Stock-based Compensation (Tables)
9 Months Ended
Mar. 31, 2019
Notes Tables  
Nonvested Restricted Stock Shares Activity [Table Text Block]
   
Nine Months Ended
March 31, 2019
 
   
Shares Under
Options
   
Weighted
Average Exercise
Price
 
Outstanding, June 30, 2018
   
35,625
    $
10.01
 
Granted
   
     
 
Exercised
   
35,625
    $
10.01
 
Forfeited
   
     
 
Outstanding, March 31, 2019
   
    $
 
Aggregate intrinsic value
  $
     
 
 
Exercisable, end of period
   
    $
 
Aggregate intrinsic value
  $
     
 
 
Available for grant, end of period