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INVESTMENTS - Narrative (Details) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) industry portfolioCompany state investment | Jan. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 31, 2022 USD ($) | Nov. 30, 2022 USD ($) | Mar. 31, 2023 USD ($) industry portfolioCompany state investment | Mar. 31, 2023 USD ($) industry portfolioCompany state investment | Mar. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) investment
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Number of proprietary investments | investment | 46 |  |  |  |  | 46 | 46 |  | 46
Investments owned, fair value | $ 678,759,000 |  |  |  |  | $ 678,759,000 | $ 678,759,000 |  | $ 649,615,000
Purchase of investments |  |  |  |  |  |  | 77,469,000 | $ 121,569,000 |
Line of credit commitment |  |  |  |  |  |  | 58,167,000 |  | 74,846,000
Cost | $ 696,031,000 |  |  |  |  | $ 696,031,000 | $ 696,031,000 |  | 656,053,000
Number of investment portfolio company | portfolioCompany | 51 |  |  |  |  | 51 | 51 |  |
Number of states which have invested in the company location | state | 24 |  |  |  |  | 24 | 24 |  |
Number of industries that have made investments | industry | 13 |  |  |  |  | 13 | 13 |  |
Weighted average investment owned, at cost, amount | $ 13,600,000 |  |  |  |  | $ 13,600,000 | $ 13,600,000 |  | 12,600,000
Uncollectible receivables allowance, minimum required day for uncollectible adjustment |  |  |  |  |  |  | 90 days |  |
Gross receivables from portfolio companies | 600,000 |  |  |  |  | 600,000 | $ 600,000 |  | 500,000
Allowance for uncollectible receivables | 0 |  |  |  |  | 0 | 0 |  | 0
Leeds Novamark Capital I, L.P |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Investments owned, fair value | 200,000 |  |  |  |  | 200,000 | $ 200,000 |  |
Proceeds from equity |  |  |  |  | $ 6,000,000 |  |  |  |
Realized investment gains |  |  |  |  | $ 4,400,000 |  |  |  |
R2i Holdings, LLC |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from the sale of investments |  |  | $ 19,200,000 |  |  |  |  |  |
NeoGraf Solutions, LLC |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Purchase of investments |  | $ 29,000,000 |  |  |  |  |  |  |
Line of credit commitment |  | $ 4,500,000 |  |  |  |  |  |  |
Salt & Straw, LLC |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  | $ 6,300,000 |  |  |
Leadpoint Business Services, LLC |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Purchase of investments | 13,500,000 |  |  |  |  |  |  |  |
Line of credit commitment | 5,500,000 |  |  |  |  |  |  |  |
Funded line of credit | $ 5,500,000 |  |  |  |  |  |  |  |
Targus Cayman HoldCo Ltd. |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Realized investment gains |  |  |  | $ 5,900,000 |  |  |  |  |
Net proceeds from the sale of investments |  |  |  | $ 8,000,000 |  |  |  |  |
B. Riley Financial, Inc. – Term Debt |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Investment, interest rate, paid in cash | 6.75% |  |  | 6.75% |  | 6.75% | 6.75% |  |
Cost |  |  |  | $ 2,400,000 |  |  |  |  |
Principal or Proprietary Transactions |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Investments owned, fair value | $ 668,500,000 |  |  |  |  | $ 668,500,000 | $ 668,500,000 |  | $ 630,800,000
Syndicated Investments |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Number of proprietary investments | investment | 5 |  |  |  |  | 5 | 5 |  | 6
Investments owned, fair value | $ 10,200,000 |  |  |  |  | $ 10,200,000 | $ 10,200,000 |  | $ 18,800,000
Investment Portfolio Benchmark | Investment Type Concentration Risk | Principal or Proprietary Transactions |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  | 98.50% |  | 97.10%
Investment Portfolio Benchmark | Investment Type Concentration Risk | Syndicated Investments |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  | 1.50% |  | 2.90%
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |
Investments owned, fair value | $ 178,600,000 |  |  |  |  | $ 178,600,000 | $ 178,600,000 |  | $ 174,500,000
Concentration risk, percentage |  |  |  |  |  |  | 26.30% |  | 26.90%

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