Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details 2)

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Intangible Assets (Details 2) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Minimum
         
Intangible Assets          
Estimated useful lives of acquired intangible assets (in years)     1 year    
Maximum
         
Intangible Assets          
Estimated useful lives of acquired intangible assets (in years)     10 years    
Solar
         
Intangible Assets          
Royalties earned $ 16,600 $ 19,800 $ 32,600 $ 38,400  
Unpaid earned royalties     $ 16,600   $ 17,500
Years subject to payment of per-unit royalty fees     17 years    
CPS
         
Intangible Assets          
Capacity of microturbine product line (in kW)     100