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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
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |
Realized Gains (Loss) | $ 11,124,864 | $ 1,051,079 | $ 705,493
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, ACV Auctions, Inc. stock sold |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (53,094) |  |
Realized Gains (Loss) | 3,450,092 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Ares Capital Corporation stock sold |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (267,140) |  |
Realized Gains (Loss) | 176,794 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, BMP Food Service Supply Holdco, LLC debt repayment |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (34,838) |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Barings BDC, Inc. stock sold |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (333,352) |  |
Realized Gains (Loss) | 59,282 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Carlyle Secured Lending Inc. stock sold |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (899,749) |  |
Realized Gains (Loss) | 598,371 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, DSD Operating, LLC escrow receipt |  |  |
Schedule of Investments [Line Items] |  |  |
Realized Gains (Loss) | 23,699 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, FS KKR Capital Corp. stock sold |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (755,058) |  |
Realized Gains (Loss) | 190,072 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Filterworks Acquisition USA, LLC debt repayment |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (206,250) |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Knoa Software, Inc. liquidated |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (1,229,155) |  |
Realized Gains (Loss) | (1,229,155) |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Mattison Avenue Holdings LLC loan repayment |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (1,894,470) |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Mezmeriz, Inc. liquidated |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (742,850) |  |
Realized Gains (Loss) | (742,850) |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Nailbiter, Inc. debt repayment |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (2,250,000) |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, PennantPark Investment Corporation stock sold |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (892,212) |  |
Realized Gains (Loss) | 484,834 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Pressure Pro, Inc. debt repayment |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (1,427,452) |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, SciAps, Inc. debt repayment and equity sale |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (5,213,984) |  |
Realized Gains (Loss) | 7,716,461 |  |
Investment, Identifier [Axis]: Investments repaid, sold or liquidated, Tilson Technology Management, Inc. asset sale |  |  |
Schedule of Investments [Line Items] |  |  |
Realized Gains (Loss) | 397,264 |  |
Investment, Identifier [Axis]: Net change in investments, at cost and total realized gain |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (245,371) |  |
Realized Gains (Loss) | 11,124,864 |  |
Investment, Identifier [Axis]: New investments, BMP Food Service Supply Holdco, LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 107,619 |  |
Investment, Identifier [Axis]: New investments, ITA Acquisition, LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 458,333 |  |
Investment, Identifier [Axis]: New investments, Mattison Avenue Holdings LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 5,500,000 |  |
Investment, Identifier [Axis]: New investments, Mobile RN Holdings LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 2,875,000 |  |
Investment, Identifier [Axis]: New investments, Mountain Regional Equipment Solutions |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 3,204,545 |  |
Investment, Identifier [Axis]: New investments, Seybert’s Billiards Corporation |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 1,800,000 |  |
Investment, Identifier [Axis]: Other changes to investments, BMP Swanson Holdco, LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 177,911 |  |
Investment, Identifier [Axis]: Other changes to investments, Caitec, Inc. interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 590,424 |  |
Investment, Identifier [Axis]: Other changes to investments, FCM Industries Holdco LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 46,681 |  |
Investment, Identifier [Axis]: Other changes to investments, Filterworks Acquisition USA, LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 253,952 |  |
Investment, Identifier [Axis]: Other changes to investments, GoNoodle, Inc. interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 14,314 |  |
Investment, Identifier [Axis]: Other changes to investments, HDI Acquisition LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 21,519 |  |
Investment, Identifier [Axis]: Other changes to investments, Highland All About People Holdings, Inc. interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 125,904 |  |
Investment, Identifier [Axis]: Other changes to investments, ITA Acquisition, LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 457,837 |  |
Investment, Identifier [Axis]: Other changes to investments, Inter-National Electronic Alloys LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 33,995 |  |
Investment, Identifier [Axis]: Other changes to investments, Mattison Avenue Holdings, LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 72,902 |  |
Investment, Identifier [Axis]: Other changes to investments, Mobile RN Holdings LLC interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 6,319 |  |
Investment, Identifier [Axis]: Other changes to investments, Mountain Regional Equipment Solutions OID amortization |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 12,000 |  |
Investment, Identifier [Axis]: Other changes to investments, Pressure Pro, Inc. OID amortization and interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 66,721 |  |
Investment, Identifier [Axis]: Other changes to investments, Seybert’s Billiards Corporation OID amortization and interest conversion |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 128,257 |  |
Investment, Identifier [Axis]: Total of investments repaid, sold, liquidated or converted |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | (16,199,604) |  |
Realized Gains (Loss) | 11,124,864 |  |
Investment, Identifier [Axis]: Total of new investments |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | 13,945,497 |  |
Investment, Identifier [Axis]: Total of other changes to investments |  |  |
Schedule of Investments [Line Items] |  |  |
Cost Increase (Decrease) | $ 2,008,736 |  |

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- Definition Increase (decrease) in investment at cost. + References No definition available. + Details
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Namespace Prefix: | rand_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. 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