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Fair Value Measurements, Quantitative Information About Level 3 and Investments in Certain Entities Carried at Fair Value (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Information about Significant Unobservable Inputs Used for Recurring Fair Value Measurements for Certain Level 3 Instruments [Abstract]    
Financial assets, fair value $ 44,300,686 $ 33,657,745
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]    
Equity securities 106,191,232 78,075,187 [1]
Unfunded commitments 6,889,304 6,856,072
Growth Equity Redeemable [Member]    
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]    
Unfunded commitments $ 0 $ 0
Redemption frequency Quarterly Quarterly
Redemption notice period 45 days 45 days
Growth Equity Non-Redeemable [Member]    
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]    
Unfunded commitments $ 6,889,304 $ 6,856,072
Net Asset Value [Member]    
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]    
Equity securities 40,690,715 30,496,625
Net Asset Value [Member] | Growth Equity Redeemable [Member]    
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]    
Equity securities 28,847,190 21,713,727
Net Asset Value [Member] | Growth Equity Non-Redeemable [Member]    
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]    
Equity securities 11,843,525 8,782,898
Net Asset Value [Member] | Common Stock [Member]    
Information about Significant Unobservable Inputs Used for Recurring Fair Value Measurements for Certain Level 3 Instruments [Abstract]    
Financial assets, fair value 40,690,715 30,496,625
Pricing Model [Member] | Common Stock [Member]    
Information about Significant Unobservable Inputs Used for Recurring Fair Value Measurements for Certain Level 3 Instruments [Abstract]    
Financial assets, fair value $ 3,609,971 $ 3,161,120
[1] Balance sheet audited at December 31, 2019.