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Note 9 - Stock Based Compensation - Summary of Stock Options (Details) - USD ($)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Outstanding (in shares) 35,625  
Outstanding, weighted average exercise price (in dollars per share) $ 10.01  
Options exercisable, number of shares (in shares) 35,625  
Options exercisable, weighted average exercise price (in dollars per share) $ 10.01  
The 2010 Plan [Member]    
Outstanding (in shares) 265,000 405,000
Outstanding, weighted average exercise price (in dollars per share) $ 10 $ 10.24
Granted (in shares) 0 0
Granted, weighted average exercise price (in dollars per share)
Exercised (in shares) (229,375) (140,000)
Exercised, weighted average exercise price (in dollars per share) $ 10 $ 10.69
Forfeited (in shares)
Forfeited, weighted average exercise price (in dollars per share)
Outstanding (in shares) 35,625 265,000
Outstanding, weighted average exercise price (in dollars per share) $ 10.01 $ 10
Aggregate intrinsic value, outstanding $ 454,937 $ 2,232,848
Options exercisable, number of shares (in shares) 35,625 265,000
Options exercisable, weighted average exercise price (in dollars per share) $ 10.01 $ 10
Aggregate intrinsic value, exercisable $ 454,937 $ 2.232848
Available for grant, end of year (in shares) 384,094 39,094
Weighted average fair value of options granted during the year (1) (in dollars per share) [1]
[1] There were no options granted during the years ended June 30, 2018 and 2017.