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 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Intangible Assets          
Years subject to payment of per-unit royalty fees     17 years    
Royalties earned $ 7,700 $ 6,200 $ 20,100 $ 22,600  
Unpaid earned royalties $ 73,000   $ 73,000   $ 52,000