Fair Value Measurements - Change in Level 2 Assets (Details) - USD ($) |
6 Months Ended | |
|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Proceeds from the sale of investment securities | $ 11,637 | $ 0 |
| Gain on sale | $ 6,046 | 0 |
| Eurosite Power, Inc. | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale Equity, Number of Shares Sold | 93,187 | |
| Fair Value, Measurements, Recurring | Level 2 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value, beginning | $ 118,084 | 216,487 |
| Sale of 93,187 shares | (5,591) | |
| Unrealized loss included in net income for the six months ended June 30, 2019 | 56,246 | (98,403) |
| Fair value, ending | 118,084 | |
| Fair Value, Measurements, Recurring | Level 2 | Eurosite Power, Inc. | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value, ending | $ 168,739 | $ 118,084 |
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- Definition Available-for-sale Equity, Number of Shares Sold No definition available.
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- Definition Increase (Decrease) in Available-for-sale Securities, Equity Securities No definition available.
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. No definition available.
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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 gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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- Definition Amount of cash inflow from the sale of tangible or intangible assets used to produce goods or deliver services, classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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