Annual report [Section 13 and 15(d), not S-K Item 405]

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

Schedule Of Consolidated Changes In Investments At Cost And Realized Gain - Schedule of changes in investments at cost and realized gain (Details)	12 Months Ended
	Dec. 31, 2025 USD ($)
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Carolina Skiff LLC equity sale
Schedule of Investments [Line Items]
Cost Increase (Decrease)	$ (34,755)
Realized Gains (Loss)	684
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, GoNoodle, Inc. warrant expiration
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(25)
Realized Gains (Loss)	(25)
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, HDI Acquisition LLC debt repayment
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(1,071,824)
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Lumious loan repayment and realized loss
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(789,944)
Realized Gains (Loss)	(77,314)
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Mattison Avenue Holdings LLC loan repayment
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(5,572,902)
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Microcision LLC escrow receipt
Schedule of Investments [Line Items]
Realized Gains (Loss)	55,357
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Pressure Pro, Inc. debt repayment and warrant sale
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(1,755,150)
Realized Gains (Loss)	870,000
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Seybert’s Billiards Corporation debt repayment
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(7,748,770)
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Tilson Technology Management, Inc. liquidation
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(2,850,015)
Realized Gains (Loss)	(2,850,015)
Investment, Identifier [Axis]: Net change in investments, at cost and total realized loss
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(11,057,836)
Realized Gains (Loss)	(2,001,313)
Investment, Identifier [Axis]: New investments, BMP Food Service Supply Holdco, LLC
Schedule of Investments [Line Items]
Cost Increase (Decrease)	400,000
Investment, Identifier [Axis]: New investments, Bauer Sheet Metal and Fabricating Inc.
Schedule of Investments [Line Items]
Cost Increase (Decrease)	3,250,000
Investment, Identifier [Axis]: New investments, BlackJet Direct Marketing, LLC
Schedule of Investments [Line Items]
Cost Increase (Decrease)	2,500,000
Investment, Identifier [Axis]: New investments, Carolina Skiff LLC
Schedule of Investments [Line Items]
Cost Increase (Decrease)	34,755
Investment, Identifier [Axis]: New investments, ITA Acquisition, LLC
Schedule of Investments [Line Items]
Cost Increase (Decrease)	375,000
Investment, Identifier [Axis]: Other changes to investments, Autotality (formerly Filterworks Acquisition USA, LLC) interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	220,923
Investment, Identifier [Axis]: Other changes to investments, BMP Food Service Supply Holdco, LLC interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	653,470
Investment, Identifier [Axis]: Other changes to investments, BMP Swanson Holdco, LLC interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	54,472
Investment, Identifier [Axis]: Other changes to investments, Bauer Sheet Metal and Fabricating Inc. OID amortization
Schedule of Investments [Line Items]
Cost Increase (Decrease)	600
Investment, Identifier [Axis]: Other changes to investments, BlackJet Direct Marketing, LLC interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	6,941
Investment, Identifier [Axis]: Other changes to investments, Caitec, Inc. interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	575,152
Investment, Identifier [Axis]: Other changes to investments, FCM Industries Holdco LLC interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	51,507
Investment, Identifier [Axis]: Other changes to investments, GoNoodle, Inc. interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	14,457
Investment, Identifier [Axis]: Other changes to investments, Highland All About People Holdings, Inc. interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	130,740
Investment, Identifier [Axis]: Other changes to investments, Inter-National Electronic Alloys LLC interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	17,177
Investment, Identifier [Axis]: Other changes to investments, Mobile RN Holdings LLC interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	25,508
Investment, Identifier [Axis]: Other changes to investments, Mountain Regional Equipment Solutions interest conversion, fee conversion and OID amortization
Schedule of Investments [Line Items]
Cost Increase (Decrease)	362,419
Investment, Identifier [Axis]: Other changes to investments, Pressure Pro, Inc. OID amortization and interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	22,445
Investment, Identifier [Axis]: Other changes to investments, Seybert’s Billiards Corporation OID amortization and interest conversion
Schedule of Investments [Line Items]
Cost Increase (Decrease)	69,983
Investment, Identifier [Axis]: Total of investments repaid, sold, liquidated or converted
Schedule of Investments [Line Items]
Cost Increase (Decrease)	(19,823,385)
Realized Gains (Loss)	(2,001,313)
Investment, Identifier [Axis]: Total of new investments
Schedule of Investments [Line Items]
Cost Increase (Decrease)	6,559,755
Investment, Identifier [Axis]: Total of other changes to investments
Schedule of Investments [Line Items]
Cost Increase (Decrease)	$ 2,205,794