Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Solar Turbines (Details)

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Intangible Assets - Solar Turbines (Details) - Solar - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Intangible Assets          
Years subject to payment of per-unit royalty fees     17 years    
Royalties earned $ 7,200 $ 6,400 $ 13,700 $ 14,700  
Unpaid earned royalties $ 7,200   $ 7,200   $ 10,000