Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Purchase price of shares to fair market value (in hundredths) 85.00%  
Employee Qualified Stock Purchase Plan [Abstract]    
Purchase price of shares to fair market value (in hundredths) 85.00%  
Number of shares authorized (in shares) 16,667  
Common stock issued stock purchase plans (in shares) 0 0
Number of shares available for future purchase (in shares)   3,705
Savings and Investment Plan [Abstract]    
Employer matching contribution (in hundredths) 4.00%  
Maximum annual employee contribution (in hundredth) 15.00%  
Employer contribution amount $ 57 $ 42
1998 Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares) 333,333  
Term of awards 10 years  
2007 Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares) 200,000  
Number of shares available for grant (in shares) 21,295  
Term of awards 10 years  
Purchase price of shares to fair market value (in hundredths) 100.00%  
Maximum exercise period for vested nonqualified stock option 12 months  
Directors Option Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares) 66,667  
Number of shares available for grant (in shares) 1,667  
Number of shares eligible for grant on first anniversary (in shares) 833  
Award vesting rights 1/12th of the total number of shares will vest on the first day of each calendar month following the date of Option grant