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Goodwill and Intangible Assets (Details 2) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Intangible assets, net      
Carrying Amount $ 22,595,000 $ 14,395,000  
Accumulated Amortization 7,177,000 4,576,000  
Net 15,418,000 9,819,000  
Estimated amortization expense      
2014 2,355,000    
2015 2,324,000    
2016 2,304,000    
2017 2,186,000    
2018 2,043,000    
Additional disclosure      
Amortization expense 2,601,000 1,490,000 1,183,000
Impairment loss   350,000  
Intellectual property
      
Intangible assets, net      
Carrying Amount 4,991,000 4,091,000  
Accumulated Amortization 1,037,000 542,000  
Net 3,954,000 3,549,000  
Intellectual property | Minimum
      
Intangible assets, net      
Useful Life 10 years 10 years  
Intellectual property | Maximum
      
Intangible assets, net      
Useful Life 16 years 16 years  
Trade names
      
Intangible assets, net      
Carrying Amount 2,296,000 1,596,000  
Accumulated Amortization 248,000 27,000  
Net 2,048,000 1,569,000  
Useful Life 10 years 10 years  
Customer relationships
      
Intangible assets, net      
Carrying Amount 14,485,000 8,185,000  
Accumulated Amortization 5,345,000 3,555,000  
Net 9,140,000 4,630,000  
Customer relationships | Minimum
      
Intangible assets, net      
Useful Life 7 years 7 years  
Customer relationships | Maximum
      
Intangible assets, net      
Useful Life 8 years 6 months 8 years 6 months  
Non-compete agreements
      
Intangible assets, net      
Carrying Amount 823,000 523,000  
Accumulated Amortization 547,000 452,000  
Net $ 276,000 $ 71,000  
Non-compete agreements | Minimum
      
Intangible assets, net      
Useful Life 3 years 3 years  
Non-compete agreements | Maximum
      
Intangible assets, net      
Useful Life 5 years 5 years