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Valuation and Qualifying Accounts
12 Months Ended
Mar. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
 (9)          Valuation and Qualifying Accounts
 
Activity in the Company’s valuation and qualifying accounts consists of the following (in thousands):
 
    Year Ended March 31,
   
2013
 
2012
 
2011
Allowance for doubtful accounts:
                 
Balance at beginning of period
  $ 5     $ 6     $ 5  
Provision for doubtful accounts
    56       47       48  
Write-off of uncollectible accounts receivable
    (56 )     (48 )     (47 )
                         
Balance at end of year
  $ 5     $ 5     $ 6