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Fair Value Measurements, Quantitative Information About Level 3 and Investments in Certain Entities Carried at Fair Value (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Information about Significant Unobservable Inputs Used for Recurring Fair Value Measurements for Certain Level 3 Instruments [Abstract]      
Financial assets, fair value $ 25,866,396   $ 34,514,762
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]      
Equity securities 65,588,029   78,661,793 [1]
Unfunded commitments 2,295,675 $ 163,750  
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    
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 $ 2,295,675 $ 163,750  
Net Asset Value [Member]      
Investments in Certain Entities Carried at Fair Value Using Net Asset Value per Share [Abstract]      
Equity securities 22,814,521 24,239,952  
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 18,482,622 21,270,734  
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 4,331,899 $ 2,969,218  
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 22,814,521   24,239,952
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 $ 3,051,875   $ 10,274,810
[1] Balance sheet audited at December 31, 2019.