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Share-Based Payments - Summary of option activity under the equity plans (Details) - Stock options - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Shares    
Exercised (12,000) (91,000)
Forfeited (67,000) (91,000)
Equity Plans    
Shares    
Outstanding at March 31, 2018 151,000  
Granted 0  
Exercised (12,000)  
Forfeited (67,000)  
Outstanding at March 31, 2019 72,000 151,000
Exercisable at March 31, 2019 67,000  
Weighted Average Exercise Price    
Outstanding at March 31, 2018 $ 11.25  
Granted 0  
Exercised 1.33  
Forfeited 12.78  
Outstanding at March 31, 2019 10.71 $ 11.25
Exercisable at March 31, 2019 $ 10.64  
Weighted Average Remaining Contractual Term    
Outstanding at March 31, 2019 4 years 1 month 6 days  
Exercisable at March 31, 2019 3 years 11 months 15 days  
Aggregate Intrinsic Value    
Outstanding at March 31, 2019 $ 51  
Exercisable at March 31, 2019 $ 51