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STOCKHOLDERS' EQUITY: - ESPP (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Share-based Activity - Other disclosures      
Number of shares available for issuance 12,100,000    
ESPP      
Share-based Activity - Other disclosures      
Number of shares available for issuance 600,000    
Shares purchased by the employees 276,475    
Share-based compensation expense $ 0.4 $ 0.2 $ 0.3