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
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Intangible Assets      
Years subject to payment of per-unit royalty fees 17 years    
Royalties earned $ 5,600 $ 6,000  
Unpaid earned royalties $ 59,400   $ 53,800