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Product Warranty Costs
6 Months Ended
Sep. 30, 2011
Product Warranty Costs [Abstract] 
Product Warranty Costs
NOTE 6. Product Warranty Costs
Equipment has a one year warranty for which a reserve is established using historical averages and specific program contingencies when considered necessary. Changes in the carrying amount of accrued product warranty costs for the six month period ended September 30, 2011 are summarized as follows.
         
Balance at March 31, 2011
  $ 255  
Warranty costs incurred
    (79 )
Change in estimates to pre-existing warranties
    (88 )
Product warranty accrual
    89  
 
     
Balance at September 30, 2011
  $ 177