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STOCK PLANS AND STOCK-BASED COMPENSATION (Detail Textuals 1) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2017
Jul. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Intrinsic value of stock options exercised $ 67,000  
Method used Black-Scholes stock option valuation model  
1998 And 2003 Stock Option Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum term of stock options 10 years  
1998 And 2003 Stock Option Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options vesting period 0 years  
1998 And 2003 Stock Option Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options vesting period 5 years  
2017 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock reserved issuance under the 2017 Plan   1,800,000