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Fair Value Measurements - Fair value measurements of marketable securities (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | $ 510,151 | $ 6,251,980 | $ 1,310,000 | $ 1,287,500
Proceeds from sale | (628,715) | $ 0 |  |
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | 510,151 |  | 1,310,000 |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | 0 |  | 0 |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | 0 |  | 0 |
Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | 510,151 |  | 1,310,000 |
Equity securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | 510,151 |  | 1,310,000 |
Equity securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | 0 |  | 0 |
Equity securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Marketable securities | $ 0 |  | $ 0 |

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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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