Annual report pursuant to Section 13 and 15(d)

Schedule Of Consolidated Changes In Investments At Cost And Realized Gain - Schedule of changes in investments at cost and realized gain (Details)

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Schedule Of Consolidated Changes In Investments At Cost And Realized Gain - Schedule of changes in investments at cost and realized gain (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Cost Increase (Decrease) $ 12,649,369    
Realized Gains (Loss) 1,051,079 $ 705,493 $ 5,820,354
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, ACV Auctions, Inc. stock sold      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) (34,125)    
Realized Gains (Loss) 1,718,767    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, BMP Food Service Supply Holdco, LLC debt repayment and equity sale      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) (850,047)    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, ClearView Social Inc. escrow receipt      
Schedule of Investments [Line Items]      
Realized Gains (Loss) 10,432    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, DSD Operating, LLC debt repayment and equity sale      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) (4,238,934)    
Realized Gains (Loss) 2,459,819    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, HDI Acquisition LLC debt repayment      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) (300,000)    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Mercantile Adjustment Bureau, LLC escrow receipt      
Schedule of Investments [Line Items]      
Realized Gains (Loss) 3,440    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Microcision LLC additional proceeds      
Schedule of Investments [Line Items]      
Realized Gains (Loss) 115,010    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Rheonix, Inc. liquidated      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) (2,802,731)    
Realized Gains (Loss) (2,802,731)    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, SocialFlow, Inc. escrow loss      
Schedule of Investments [Line Items]      
Realized Gains (Loss) (4,941)    
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Somerset Gas Transmission Company, LLC equity sale      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) (719,097)    
Realized Gains (Loss) (448,717)    
Investment, Identifier [Axis]: New investments, BMP Food Service Supply Holdco, LLC      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 4,535,000    
Investment, Identifier [Axis]: New investments, Caitec, Inc.      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 72,522    
Investment, Identifier [Axis]: New investments, FCM Industries Holdco LLC      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 3,800,000    
Investment, Identifier [Axis]: New investments, Highland All About People Holdings, Inc.      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 4,000,000    
Investment, Identifier [Axis]: New investments, ITA Acquisition, LLC      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 390,000    
Investment, Identifier [Axis]: New investments, Inter-National Electronic Alloys LLC      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 4,300,000    
Investment, Identifier [Axis]: New investments, Pressure Pro, Inc.      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 3,000,000    
Investment, Identifier [Axis]: New investments, Tilson Technology Management, Inc.      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 250,000    
Investment, Identifier [Axis]: Other changes to investments, BMP Swanson Holdco, LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 100,115    
Investment, Identifier [Axis]: Other changes to investments, Caitec, Inc. interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 228,606    
Investment, Identifier [Axis]: Other changes to investments, DSD Operating, LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 31,652    
Investment, Identifier [Axis]: Other changes to investments, FCM Industries Holdco LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 18,156    
Investment, Identifier [Axis]: Other changes to investments, Filterworks Acquisition USA, LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 247,841    
Investment, Identifier [Axis]: Other changes to investments, GoNoodle, Inc. interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 14,170    
Investment, Identifier [Axis]: Other changes to investments, HDI Acquisition LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 22,523    
Investment, Identifier [Axis]: Other changes to investments, Highland All About People Holdings, Inc. interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 49,187    
Investment, Identifier [Axis]: Other changes to investments, ITA Acquisition, LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 222,753    
Investment, Identifier [Axis]: Other changes to investments, Inter-National Electronic Alloys LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 49,839    
Investment, Identifier [Axis]: Other changes to investments, Mattison Avenue Holdings, LLC interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 37,934    
Investment, Identifier [Axis]: Other changes to investments, Pressure Pro, Inc. OID amortization and interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 93,436    
Investment, Identifier [Axis]: Other changes to investments, SciAps, Inc. OID amortization      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 5,000    
Investment, Identifier [Axis]: Other changes to investments, Seybert’s Billiards Corporation OID amortization and interest conversion      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 125,569    
Investment, Identifier [Axis]: Total of investments repaid, sold, liquidated or converted      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) (8,944,934)    
Realized Gains (Loss) 1,051,079    
Investment, Identifier [Axis]: Total of new investments      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) 20,347,522    
Investment, Identifier [Axis]: Total of other changes to investments      
Schedule of Investments [Line Items]      
Cost Increase (Decrease) $ 1,246,781