Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Solar Turbines (Details)

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Intangible Assets - Solar Turbines (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Intangible Assets          
Years subject to payment of per-unit royalty fees     17 years    
Royalties earned $ 6,100 $ 9,200 $ 12,400 $ 16,400  
Unpaid earned royalties $ 65,000   $ 65,000   $ 52,000