CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES - USD ($) $ in Thousands |
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Assets | ||||||||||||||||||||||||
| Investments at fair value | $ 2,097,446 | [1],[2],[3],[4],[5] | $ 1,785,299 | [6],[7],[8],[9],[10] | ||||||||||||||||||||
| Cash and cash equivalents | 29,045 | 43,221 | ||||||||||||||||||||||
| Restricted cash | 400 | 1,650 | ||||||||||||||||||||||
| Receivables: | ||||||||||||||||||||||||
| Dividends and interest | 31,678 | 30,303 | ||||||||||||||||||||||
| Escrow | 612 | 1,926 | ||||||||||||||||||||||
| Other | 2,190 | 2,018 | ||||||||||||||||||||||
| Income tax receivable | 717 | 94 | ||||||||||||||||||||||
| Debt issuance costs (net of accumulated amortization of $13,172 and $10,357, respectively) | 6,870 | 9,266 | ||||||||||||||||||||||
| Other assets | 8,560 | 9,063 | ||||||||||||||||||||||
| Total assets | 2,177,518 | 1,882,840 | ||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Credit Facilities | 345,000 | 343,000 | ||||||||||||||||||||||
| Other liabilities | 21,629 | 23,038 | ||||||||||||||||||||||
| Accrued restoration plan liability | 529 | 555 | ||||||||||||||||||||||
| Income tax payable | 636 | 2,769 | ||||||||||||||||||||||
| Deferred tax liability | 12,507 | 16,780 | ||||||||||||||||||||||
| Total liabilities | 1,166,526 | 999,207 | ||||||||||||||||||||||
| Commitments and contingencies (Note 12) | ||||||||||||||||||||||||
| Net Assets | ||||||||||||||||||||||||
| Common stock, $0.25 par value: authorized, 75,000,000 shares at March 31, 2026 and March 31, 2025; issued, 60,577,181 shares at March 31, 2026 and 52,912,796 shares at March 31, 2025 | 15,144 | 13,228 | ||||||||||||||||||||||
| Additional paid-in capital | 1,074,854 | 959,123 | ||||||||||||||||||||||
| Total distributable (loss) earnings | (79,006) | (88,718) | ||||||||||||||||||||||
| Total net assets | 1,010,992 | 883,633 | ||||||||||||||||||||||
| Total liabilities and net assets | $ 2,177,518 | $ 1,882,840 | ||||||||||||||||||||||
| Net asset value per share (in usd per share) | $ 16.69 | $ 16.70 | ||||||||||||||||||||||
| SBA Debentures | ||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| SBA Debentures (net of $5,333 and $4,082, respectively, of unamortized debt issuance costs) | $ 217,667 | $ 170,918 | ||||||||||||||||||||||
| October 2026 Notes | ||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Notes | 0 | 148,846 | ||||||||||||||||||||||
| August 2028 Notes | ||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Notes | 0 | 70,194 | ||||||||||||||||||||||
| 2029 Convertible Notes | ||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Notes | 224,587 | 223,107 | ||||||||||||||||||||||
| September 2030 Notes | ||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Notes | 343,971 | 0 | ||||||||||||||||||||||
| Non-control/Non-affiliate investments | ||||||||||||||||||||||||
| Assets | ||||||||||||||||||||||||
| Investments at fair value | 1,682,425 | 1,436,316 | ||||||||||||||||||||||
| Affiliate investments | ||||||||||||||||||||||||
| Assets | ||||||||||||||||||||||||
| Investments at fair value | 340,760 | 292,891 | ||||||||||||||||||||||
| Control investments | ||||||||||||||||||||||||
| Assets | ||||||||||||||||||||||||
| Investments at fair value | $ 74,261 | $ 56,092 | ||||||||||||||||||||||
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- Definition Accrued Restoration Plan Liability No definition available.
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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of dividend and interest receivable from investment. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Fair value of investment in security owned. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of debt instrument classified as medium-term. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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- Definition Amount of assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of liabilities classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount due from parties in nontrade transactions, classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of accumulated undistributed earnings (deficit). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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