Fair Value Measurements - Change in Level 2 Assets (Details) - Fair Value, Measurements, Recurring - Level 2 - USD ($) |
6 Months Ended | |
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Jun. 30, 2022 |
Jun. 30, 2021 |
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| 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 | 56,246 |
| Fair value, ending | 112,492 | 168,739 |
| Eurosite Power, Inc. | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value, ending | $ 112,492 | $ 168,739 |
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- Definition Increase (Decrease) in Available-for-sale Securities, Equity Securities No definition available.
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of unrealized gain (loss) on investment in marketable security. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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