Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details 4)

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Commitments and Contingencies (Details 4) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Sep. 30, 2010
kW
Mar. 31, 2014
Other disclosures    
Cost to distributors for replacement of affected stock   $ 0
Research, development and testing of a more efficient microturbine Combined Heat and Power (CHP) system | DOE
   
Commitments and Contingencies    
Projected electrical efficiency of microturbine (as a percent) 42.00%  
Power output of microturbine (in kW) 370  
Projected cost of research, development and testing project 17.4  
Contribution by other party   5.0
Expense to be incurred by the company in research and development   12.4
Period of contract   5 years
Cumulative amount of bill under contract   3.5
Research, development and testing of a more fuel flexible microturbine | DOE
   
Commitments and Contingencies    
Cumulative amount of bill under contract   $ 1.4