Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

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Intangible Assets (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Dec. 31, 2012
Manufacturing license
Mar. 31, 2012
Manufacturing license
Dec. 31, 2012
Technology
Mar. 31, 2012
Technology
Dec. 31, 2012
Parts and service customer relationships
Mar. 31, 2012
Parts and service customer relationships
Dec. 31, 2012
TA100 customer relationships
Mar. 31, 2012
TA100 customer relationships
Dec. 31, 2012
Backlog
Mar. 31, 2012
Backlog
Dec. 31, 2012
Trade name
Mar. 31, 2012
Trade name
Intangible Assets                                  
Weighted Average Amortization Period           17 years 17 years 10 years 10 years 5 years 5 years 2 years 2 years     1 year 2 months 12 days 1 year 2 months 12 days
Intangible Assets, Gross $ 8,196,000   $ 8,196,000   $ 8,196,000 $ 3,700,000 $ 3,700,000 $ 2,240,000 $ 2,240,000 $ 1,080,000 $ 1,080,000 $ 617,000 $ 617,000 $ 490,000 $ 490,000 $ 69,000 $ 69,000
Accumulated Amortization 5,761,000   5,761,000   5,385,000 3,474,000 3,437,000 653,000 485,000 630,000 468,000 617,000 617,000 318,000 309,000 69,000 69,000
Intangible assets, net 2,435,000   2,435,000   2,811,000 226,000 263,000 1,587,000 1,755,000 450,000 612,000     172,000 181,000    
Amortization expenses 100,000 200,000 400,000 600,000                          
Expected future amortization expense of intangible assets                                  
2013 (remainder of fiscal year) 294,000   294,000                            
2014 489,000   489,000                            
2015 453,000   453,000                            
2016 273,000   273,000                            
2017 273,000   273,000                            
Thereafter 653,000   653,000                            
Intangible assets, net $ 2,435,000   $ 2,435,000   $ 2,811,000 $ 226,000 $ 263,000 $ 1,587,000 $ 1,755,000 $ 450,000 $ 612,000     $ 172,000 $ 181,000