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 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Intangible Assets          
Years subject to payment of per-unit royalty fees     17 years    
Royalties earned $ 8,100 $ 9,200 $ 25,200 $ 22,900  
Unpaid earned royalties $ 18,100   $ 18,100   $ 8,000