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Financial Highlights (Details) - Schedule of Financial Highlights - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |
Net Asset Value per share at Beginning of Period |  | $ 57.49 | $ 57.08 | $ 55.3 | $ 79.46 | $ 117.92
Results of Operations: |  |  |  |  |  |
Net Investment Income/(Loss) | [1] | 3.11 | 1.48 | 6.92 | (1) | (7.66)
Net Realized Gain/(Loss) on Investments |  | (5.51) | 2.24 | (15.86) | (18.35) | (41.18)
Net Unrealized Gain/(Loss) on Investments |  | 15.27 | (6.22) | 9.47 | (3.9) | 14.13
Net loss on extinguishment of debt |  |  | (0.13) | (0.05) | (0.91) | (0.75)
Net Increase (Decrease) in Net Assets Resulting from Operations |  | 12.87 | (2.63) | 0.48 | (24.16) | (35.46)
Capital Share Transactions |  |  |  |  |  |
Distributions declared |  |  | (0.12) |  |  | (3)
Repurchase of common stock under stock repurchase program |  | 0.39 | 3.16 | 1.3 |  |
Net Increase (Decrease) Resulting from Capital Share Transactions |  | 0.39 | 3.04 | 1.3 |  | (3)
Net Asset Value per share at End of Period |  | $ 70.75 | $ 57.49 | $ 57.08 | $ 55.3 | $ 79.46
Net Assets at End of Period (in Dollars) |  | $ 146,705,535 | $ 120,845,408 | $ 143,693,981 | $ 150,619,517 | $ 216,432,530
Shares Outstanding at End of Period (in Shares) |  | 2,073,713 | 2,102,129 | 2,517,221 | 2,723,709 | 2,723,709
Per share market value at end of period |  | $ 37.9 | $ 34.88 | $ 42.9 | $ 17.83 | $ 51.8
Total return based on market value | [2] | 8.66% | (18.69%) | 140.61% | (65.58%) | (29.91%)
Total return based on net asset value | [3] | 21.40% | (15.90%) | (4.60%) | (30.41%) | (29.47%)
Portfolio turnover rate |  | 32.62% | 69.43% | 24.97% | 5.66% | 11.93%
Ratio of net investment/(loss) income to average net assets after waivers, discounts and reimbursements |  | 4.80% | 2.55% | 12.44% | (1.64%) | (7.96%)
Ratio of total expenses to average net assets |  | 10.04% | 9.02% | 9.26% | 14.64% | 25.62%
Percentage of non-recurring fee income |  | 1.61% | 2.70% | 7.94% | 2.33% | 4.29%
Average debt outstanding (in Shares) | [4] | 81,599,762 | 85,397,690 | 82,930,098 | 189,038,998 | 347,991,878
Average debt outstanding per weighted average common share |  | $ 39.18 | $ 36.75 | $ 30.97 | $ 69.4 | $ 127.76
Asset coverage ratio per unit (in Dollars) | [5] | $ 2,707 | $ 2,550 | $ 2,856 | $ 1,992 | $ 1,842
Credit Facility (in Dollars) |  | 28,441,941 |  |  |  |
Israeli Notes (in Dollars) | [6] |  |  |  |  | 105,136,927
2021 Notes [Member] |  |  |  |  |  |
Capital Share Transactions |  |  |  |  |  |
2021 Notes (in Dollars) | [7] |  |  |  | 74,012,825 | 74,012,825
2023 Notes [Member] |  |  |  |  |  |
Capital Share Transactions |  |  |  |  |  |
2023 Notes (in Dollars) |  |  | 22,521,800 | 77,846,800 | 77,846,800 | 77,846,800
2028 Notes [Member] |  |  |  |  |  |
Capital Share Transactions |  |  |  |  |  |
2028 Notes (in Dollars) |  | $ 57,500,000 | $ 57,500,000 |  |  |
[1] | Net investment income/(loss) excluding management and incentive fee waivers, discounts and reimbursements based on total weighted average common stock outstanding equals $3.11, $1.48, $6.92, $(3.35), and $(7.66) per share for the years ended September 30, 2023, 2022, 2021, 2020, and 2019, respectively.
[2] | Total return is historical and assumes changes in share price, reinvestments of all dividends and distributions at prices obtained under the Company’s dividend reinvestment plan, and no sales charge for the period.
[3] | Total return is historical and assumes changes in NAV, reinvestments of all dividends and distributions at prices obtained under the Company’s dividend reinvestment plan, and no sales charge for the period.
[4] | Based on daily weighted average carrying value of debt outstanding during the period.
[5] | Asset coverage per unit is the ratio of the carrying value of our total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness.
[6] | During the year ended September 30, 2020, the Israeli Notes were redeemed in full and ceased trading on the TASE on April 14, 2020.
[7] | During the year ended September 30, 2021, the 2021 Notes were redeemed in full and ceased trading on November 20, 2020. The average price for the year ended September 30, 2021 reflects the period from October 1, 2020 through November 20, 2020.

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