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Note 9 - Share Based Compensation - Changes in Stock Options Outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Mar. 25, 2017
Outstanding, Shares (in shares) 1,478,700 1,104,500  
Outstanding, weighted average exercise price (in dollars per share) $ 0.56 $ 1.41  
Outstanding, Weighted average remaining contractual terms (Year) 7 years 292 days 8 years 6 years 36 days
Outstanding $ 3
Granted, Shares (in shares) 50,000 856,000  
Granted, weighted average exercise price (in dollars per share) $ 0.27 $ 0.34  
Granted, Weighted average remaining contractual terms (Year) 10 years 10 years  
Forfeited / Expired, Shares (in shares) (31,000) (481,800)  
Forfeited / Expired, weighted average exercise price (in dollars per share) $ 1.41 $ 1.34  
Forfeited / Expired, Weighted average remaining contractual term (Year)  
Outstanding, Shares (in shares) 1,497,700 1,478,700 1,104,500
Outstanding, weighted average exercise price (in dollars per share) $ 0.53 $ 0.56 $ 1.41
Exercisable, Shares (in shares) 500,650    
Exercisable, weighted average exercise price (in dollars per share) $ 0.79    
Exercisable, Weighted average remaining contractual terms (Year) 4 years 146 days    
Exercisable    
Expected to vest in the future, Shares (in shares) 702,491    
Expected to vest in the future, weighted average exercise price (in dollars per share) $ 0.40    
Expected to vest in the future, Weighted average remaining contractual terms (Year) 9 years 219 days    
Expected to vest in the future