Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Solar Turbines (Details)

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Intangible Assets - Solar Turbines (Details) - Solar Turbines Incorporated - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Intangible Assets          
Years subject to payment of per-unit royalty fees     17 years    
Royalties earned $ 6,200 $ 8,100 $ 22,600 $ 25,200  
Unpaid earned royalties $ 48,700   $ 48,700   $ 26,100