Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Change in Level 2 Assets (Details)

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Fair Value Measurements - Change in Level 2 Assets (Details) - Fair Value, Measurements, Recurring - Level 2 - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, beginning $ 74,995 $ 118,084
Sale of 93,187 shares   (5,591)
Unrealized gain (loss) 37,497 37,497
Fair value, ending 112,492 149,990
Eurosite Power, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, ending $ 112,492 $ 149,990