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Fair Value Measurements - Activities of the marketable securities (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair value measurement [Abstract]    
Beginning balance $ 1,310,000 $ 1,287,500
Purchases 0 4,979,088
Proceeds from sale (628,715) 0
Unsettled sale (123,223) 0
Reclassification of net realized gains on marketable securities into earnings 51,133 0
Unrealized losses on marketable securities (99,044) (14,608)
Ending balance $ 510,151 $ 6,251,980