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Pay vs Performance Disclosure | 12 Months Ended
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Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($)
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | In accordance with the final rule adopted by the SEC in August 2022 implementing Section 953(a) of the Dodd-Frank Act, we are providing the following table that sets forth certain compensation measures for certain of our officers alongside certain performance metrics for the Company and certain of its industry peers:
Fiscal Year | Summary Compensation Table total for CEO | Compensation Actually Paid to CEO(1) | Average SCT Total for Non-CEO NEOs(2) | Average Compensation Actually Paid to Non-CEO NEOs(1) | Total Shareholder Return(3) | S&P 500 BDC Index Total Shareholder Return | Net Investment Income ($ in thousands) | Dividend Yield on NAV per Share(4)
2023 | $ | 3,479,216 |  | $ | 3,243,122 |  | $ | 2,241,018 |  | $ | 2,066,340 |  | $ | 180.35 |  | $ | 157.73 |  | $ | 68,711 |  | 13.5 | %
2022 | 3,164,276 |  | 3,648,118 |  | 2,329,343 |  | 2,646,463 |  | 202.68 |  | 191.41 |  | 42,687 |  | 15.7 |
2021 | 2,581,472 |  | 3,688,830 |  | 2,058,181 |  | 2,984,009 |  | 177.80 |  | 174.09 |  | 31,671 |  | 13.5 |
Company Selected Measure Name | Dividend yield on NAV |  |
Named Executive Officers, Footnote [Text Block] | The Non-CEO NEOs for 2023 and 2022 were Michael S. Sarner and Joshua S. Weinstein. The Non-CEO NEOs for 2021 was Michael S. Sarner. |  |
PEO Total Compensation Amount | $ 3,479,216 | $ 3,164,276 | $ 2,581,472
PEO Actually Paid Compensation Amount | $ 3,243,122 | 3,648,118 | 3,688,830
Adjustment To PEO Compensation, Footnote [Text Block] | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by our CEO or Other NEOs. These amounts reflect the Summary Compensation Table Total (SCT) with certain adjustments as set forth in the following reconciliation table:
Name | Fiscal Year | SCT Total | SCT Stock Awards | Fair Value of Stock Awards Granted in the Covered Year | Change in Fair Value of Unvested Stock Awards from Prior Years | Fair Value of Stock Awards Granted and Vested in the Covered Year | Change in Fair Value of Stock Awards from Prior Years that Vested in the Covered Year | Fair Value of Stock Awards Forfeited | Value of Dividends on Unvested Stock Awards | Compensation Actually Paid
CEO | 2023 | $ | 3,479,216 |  | $ | (1,347,186) |  | $ | 1,127,199 |  | $ | (203,793) |  | $ | — |  | $ | (144,498) |  | $ | — |  | $ | 332,184 |  | $ | 3,243,122 |
| 2022 | 3,164,276 |  | (1,260,437) |  | 1,083,702 |  | 78,458 |  | — |  | 248,443 |  | — |  | 333,676 |  | 3,648,118 |
| 2021 | 2,581,472 |  | (1,011,549) |  | 1,476,543 |  | 181,238 |  | — |  | 172,005 |  | — |  | 289,121 |  | 3,688,830 |
NEO Average | 2023 | 2,241,018 |  | (865,544) |  | 724,206 |  | (160,488) |  | — |  | (100,073) |  | — |  | 227,221 |  | 2,066,340 |
| 2022 | 2,329,343 |  | (992,593) |  | 853,414 |  | 51,699 |  | — |  | 167,858 |  | — |  | 236,742 |  | 2,646,463 |
| 2021 | 2,058,181 |  | (842,900) |  | 1,230,478 |  | 153,045 |  | — |  | 143,035 |  | — |  | 242,170 |  | 2,984,009 |
Non-PEO NEO Average Total Compensation Amount | $ 2,241,018 | 2,329,343 | 2,058,181
Non-PEO NEO Average Compensation Actually Paid Amount | $ 2,066,340 | 2,646,463 | 2,984,009
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by our CEO or Other NEOs. These amounts reflect the Summary Compensation Table Total (SCT) with certain adjustments as set forth in the following reconciliation table:
Name | Fiscal Year | SCT Total | SCT Stock Awards | Fair Value of Stock Awards Granted in the Covered Year | Change in Fair Value of Unvested Stock Awards from Prior Years | Fair Value of Stock Awards Granted and Vested in the Covered Year | Change in Fair Value of Stock Awards from Prior Years that Vested in the Covered Year | Fair Value of Stock Awards Forfeited | Value of Dividends on Unvested Stock Awards | Compensation Actually Paid
CEO | 2023 | $ | 3,479,216 |  | $ | (1,347,186) |  | $ | 1,127,199 |  | $ | (203,793) |  | $ | — |  | $ | (144,498) |  | $ | — |  | $ | 332,184 |  | $ | 3,243,122 |
| 2022 | 3,164,276 |  | (1,260,437) |  | 1,083,702 |  | 78,458 |  | — |  | 248,443 |  | — |  | 333,676 |  | 3,648,118 |
| 2021 | 2,581,472 |  | (1,011,549) |  | 1,476,543 |  | 181,238 |  | — |  | 172,005 |  | — |  | 289,121 |  | 3,688,830 |
NEO Average | 2023 | 2,241,018 |  | (865,544) |  | 724,206 |  | (160,488) |  | — |  | (100,073) |  | — |  | 227,221 |  | 2,066,340 |
| 2022 | 2,329,343 |  | (992,593) |  | 853,414 |  | 51,699 |  | — |  | 167,858 |  | — |  | 236,742 |  | 2,646,463 |
| 2021 | 2,058,181 |  | (842,900) |  | 1,230,478 |  | 153,045 |  | — |  | 143,035 |  | — |  | 242,170 |  | 2,984,009 |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | The graph below reflects the relationship between "Compensation Actually Paid to CEO" to "Average Compensation Actually Paid to Non-CEO NEOs" and total shareholder return for the Company and S&P 500 BDC Index Total Shareholder Return: |  |
Compensation Actually Paid vs. Net Income [Text Block] | The graph below reflects the relationship between "Compensation Actually Paid to CEO" to "Average Compensation Actually Paid to Non-CEO NEOs" and net investment income per share: |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | The graph below reflects the relationship between "Compensation Actually Paid to CEO" to "Average Compensation Actually Paid to Non-CEO NEOs" and dividend yield on NAV per share: |  |
Total Shareholder Return Vs Peer Group [Text Block] | The graph below reflects the relationship between "Compensation Actually Paid to CEO" to "Average Compensation Actually Paid to Non-CEO NEOs" and total shareholder return for the Company and S&P 500 BDC Index Total Shareholder Return: |  |
Total Shareholder Return Amount | $ 180.35 | 202.68 | 177.80
Peer Group Total Shareholder Return Amount | 157.73 | 191.41 | 174.09
Net Income (Loss) | $ 68,711,000 | $ 42,687,000 | $ 31,671,000
Company Selected Measure Amount | 0.135 | 15.7 | 13.5
Additional 402(v) Disclosure [Text Block] | Total Shareholder Return represents the value of a hypothetical $100 investment beginning at market close on the last trading day of fiscal year ended March 31, 2020, assuming reinvestment of all dividends.As described above, restrictions imposed by the 1940 Act restrict the Compensation Committee’s ability to use nondiscretionary or formulaic Company performance goals or criteria to determine executive incentive compensation. However, the Compensation Committee considers several financial performance metrics, along with other factors including operational goals and individual performance criteria, in determining the appropriate compensation for NEOs. Subject to the foregoing restrictions imposed by the 1940 Act, in the Company’s assessment, the following list of performance measures represent the most important performance measures used to link compensation actually paid to our NEOs, for the most recently completed fiscal year, to Company performance:Other key metrics considered by the Compensation Committee when determining the appropriate compensation for NEOs include net origination activities, maintenance of liquidity and capital flexibility and individual contributions to corporate objectives. |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Dividend yield on NAV |  |
Non-GAAP Measure Description [Text Block] | Dividend yield on NAV per share is calculated by dividing total dividends paid by beginning NAV per share. |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | total dividends paid to shareholders |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | distributable net investment income |  |
Measure [Axis]: 4 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | portfolio growth (based upon the fair value of investments) |  |
Measure [Axis]: 5 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | portfolio non-accruals |  |
Measure [Axis]: 6 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | operating leverage. |  |
PEO [Member] | Equity Awards Reported Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ (1,347,186) | $ (1,260,437) | $ (1,011,549)
PEO [Member] | Equity Awards Granted in Current Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 1,127,199 | 1,083,702 | 1,476,543
PEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (203,793) | 78,458 | 181,238
PEO [Member] | Equity Awards Granted During the Year, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0
PEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (144,498) | 248,443 | 172,005
PEO [Member] | Equity Awards, Value of Forfeited Awards Adjustment [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0
PEO [Member] | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 332,184 | 333,676 | 289,121
Non-PEO NEO [Member] | Equity Awards Reported Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (865,544) | (992,593) | (842,900)
Non-PEO NEO [Member] | Equity Awards Granted in Current Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 724,206 | 853,414 | 1,230,478
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (160,488) | 51,699 | 153,045
Non-PEO NEO [Member] | Equity Awards Granted During the Year, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (100,073) | 167,858 | 143,035
Non-PEO NEO [Member] | Equity Awards, Value of Forfeited Awards Adjustment [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0
Non-PEO NEO [Member] | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 227,221 | $ 236,742 | $ 242,170

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