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Note 8 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Employees [Member]    
Outstanding, beginning of period (in shares) 265,346  
Outstanding, weighted average exercise price (in dollars per share) $ 7.08  
Outstanding, average remaining contractual life (Year) 6 years 47 days 6 years 200 days
Number of options granted (in shares)  
Granted, weighted average exercise price (in dollars per share)  
Granted, average remaining contractual life (Year)  
Number of options expired/forfeited (in shares) (29,167)  
Expired/forfeited, weighted average exercise price (in dollars per share) $ 3.39  
Expired/forfeited, average remaining contractual life (Year)  
Outstanding, end of period (in shares) 236,179 265,346
Outstanding, weighted average exercise price (in dollars per share) $ 7.54 $ 7.08
Exercisable (in shares) 139,751  
Exercisable, weighted average exercise price (in dollars per share) $ 11.81  
Exercisable, average remaining contractual life (Year) 4 years 76 days  
Non-Executives [Member]    
Outstanding, beginning of period (in shares) 545,059  
Outstanding, weighted average exercise price (in dollars per share) $ 3.08  
Outstanding, average remaining contractual life (Year) 7 years 197 days 7 years 273 days
Number of options granted (in shares) 5,001  
Granted, weighted average exercise price (in dollars per share) $ 0.67  
Granted, average remaining contractual life (Year) 9 years 339 days  
Number of options expired/forfeited (in shares)  
Expired/forfeited, weighted average exercise price (in dollars per share)  
Expired/forfeited, average remaining contractual life (Year)  
Outstanding, end of period (in shares) 550,060 545,059
Outstanding, weighted average exercise price (in dollars per share) $ 3.04 $ 3.08
Outstanding, aggregate intrinsic value $ 300
Granted, aggregate intrinsic value 300  
Expired/forfeited, aggregate intrinsic value