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Summary of Significant Accounting Policies (Policies) | 12 Months Ended
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Dec. 31, 2022
Accounting Policies [Abstract] |
Basis of accounting | Basis of accounting—The Company’s consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”). The Company is an investment company following accounting and reporting guidance in Accounting Standards Codification Topic 946, Financial Services—Investment Companies (“ASC 946”). The Company consolidates its wholly-owned direct and indirect subsidiaries: NMF Holdings, NMFDB, NMF Servicing, SBIC I, SBIC I GP, SBIC II, SBIC II GP, NMF Ancora, NMF QID, NMF YP, NMF Permian, NMF HB, NMF TRM, NMF Pioneer and NMF OEC and its majority-owned consolidated subsidiary: NMNLC. For majority-owned consolidated subsidiaries, the third-party equity interest is referred to as non-controlling interest. The net income attributable to non-controlling interests for such subsidiaries is presented as “Net increase (decrease) in net assets resulting from operations related to non-controlling interest” in the Company’s Consolidated Statements of Operations. The portion of shareholders' equity that is attributable to non-controlling interests for such subsidiaries is presented as “Non-controlling interest”, a component of total equity, on the Company’s Consolidated Statements of Assets and Liabilities. The Company’s consolidated financial statements reflect all adjustments and reclassifications which, in the opinion of management, are necessary for the fair presentation of the results of operations and financial condition for all periods presented. All intercompany transactions have been eliminated. Revenues are recognized when earned and expenses when incurred. The financial results of the Company’s portfolio investments are not consolidated in the financial statements. The Company’s consolidated financial statements are prepared in accordance with GAAP and pursuant to the requirements for reporting on Form 10-K and Article 6 or 10 of Regulation S-X. In the opinion of management, all adjustments, consisting solely of normal recurring accruals considered necessary for the fair presentation of financial statements have been included.
Investments | Investments—The Company applies fair value accounting in accordance with GAAP. Fair value is the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Investments are reflected on the Company’s Consolidated Statements of Assets and Liabilities at fair value, with changes in unrealized gains and losses resulting from changes in fair value reflected in the Company’s Consolidated Statements of Operations as “Net change in unrealized appreciation (depreciation) of investments” and realizations on portfolio investments reflected in the Company’s Consolidated Statements of Operations as “Net realized gains (losses) on investments”. The Company values its assets on a quarterly basis, or more frequently if required under the 1940 Act. In all cases, the Company’s board of directors is ultimately and solely responsible for determining the fair value of the portfolio investments on a quarterly basis in good faith, including investments that are not publicly traded, those whose market prices are not readily available and any other situation where its portfolio investments require a fair value determination. Security transactions are accounted for on a trade date basis. The Company’s quarterly valuation procedures are set forth in more detail below: (1)Investments for which market quotations are readily available on an exchange are valued at such market quotations based on the closing price indicated from independent pricing services. (2)Investments for which indicative prices are obtained from various pricing services and/or brokers or dealers are valued through a multi-step valuation process, as described below, to determine whether the quote(s) obtained is representative of fair value in accordance with GAAP. a.Bond quotes are obtained through independent pricing services. Internal reviews are performed by the investment professionals of the Investment Adviser to ensure that the quote obtained is representative of fair value in accordance with GAAP and, if so, the quote is used. If the Investment Adviser is unable to sufficiently validate the quote(s) internally and if the investment’s par value or its fair value exceeds the materiality threshold, the investment is valued similarly to those assets with no readily available quotes (see (3) below); and b.For investments other than bonds, the Company looks at the number of quotes readily available and performs the following procedures: i.Investments for which two or more quotes are received from a pricing service are valued using the mean of the mean of the bid and ask of the quotes obtained. The Company will evaluate the reasonableness of the quote, and if the quote is determined to not be representative of fair value, the Company will use one or more of the methodologies outlined below to determine fair value; and ii.Investments for which one quote is received from a pricing service are validated internally. The investment professionals of the Investment Adviser analyze the market quotes obtained using an array of valuation methods (further described below) to validate the fair value. If the Investment Adviser is unable to sufficiently validate the quote internally and if the investment’s par value or its fair value exceeds the materiality threshold, the investment is valued similarly to those assets with no readily available quotes (see (3) below). (3)Investments for which quotations are not readily available through exchanges, pricing services, brokers, or dealers are valued through a multi-step valuation process: a.Each portfolio company or investment is initially valued by the investment professionals of the Investment Adviser responsible for the credit monitoring; b.Preliminary valuation conclusions will then be documented and discussed with the Company’s senior management; c.If an investment falls into (3) above for four consecutive quarters and if the investment’s par value or its fair value exceeds the materiality threshold, then at least once each fiscal year, the valuation for each portfolio investment for which the Company does not have a readily available market quotation will be reviewed by an independent valuation firm engaged by the Company’s board of directors; and d.When deemed appropriate by the Company’s management, an independent valuation firm may be engaged to review and value investment(s) of a portfolio company, without any preliminary valuation being performed by the Investment Adviser. The investment professionals of the Investment Adviser will review and validate the value provided. For investments in revolving credit facilities and delayed draw commitments, the cost basis of the funded investments purchased is offset by any costs/netbacks received for any unfunded portion on the total balance committed. The fair value is also adjusted for the price appreciation or depreciation on the unfunded portion. As a result, the purchase of a commitment not completely funded may result in a negative fair value until it is called and funded. The values assigned to investments are based upon available information and do not necessarily represent amounts which might ultimately be realized, since such amounts depend on future circumstances and cannot be reasonably determined until the individual positions are liquidated. Due to the inherent uncertainty of determining the fair value of investments that do not have a readily available market value, the fair value of the Company’s investments may fluctuate from period to period and the fluctuations could be material.
Collateralized agreements or repurchase financings | Collateralized agreements or repurchase financings—The Company follows the guidance in Accounting Standards Codification Topic 860, Transfers and Servicing—Secured Borrowing and Collateral (“ASC 860”), when accounting for transactions involving the purchases of securities under collateralized agreements to resell (resale agreements). These transactions are treated as collateralized financing transactions and are recorded at their contracted resale or repurchase amounts, as specified in the respective agreements. Interest on collateralized agreements is accrued and recognized over the life of the transaction and included in interest income.
Cash and cash equivalents | Cash and cash equivalents—Cash and cash equivalents include cash and short-term, highly liquid investments. The Company defines cash equivalents as securities that are readily convertible into known amounts of cash and so near maturity that there is insignificant risk of changes in value. These securities have original maturities of three months or less.
Revenue recognition | Revenue recognition Sales and paydowns of investments: Realized gains and losses on investments are determined on the specific identification method. Interest and dividend income: Interest income, including amortization of premium and discount using the effective interest method, is recorded on the accrual basis and periodically assessed for collectability. Interest income also includes interest earned from cash on hand. Upon the prepayment of a loan or debt security, any prepayment penalties are recorded as part of interest income. The Company has loans and certain preferred equity investments in the portfolio that contain a payment-in-kind (“PIK”) interest or dividend provision. PIK interest and dividends are accrued and recorded as income at the contractual rates, if deemed collectible. The PIK interest and dividends are added to the principal or share balances on the capitalization dates and are generally due at maturity or when redeemed by the issuer. For the years ended December 31, 2022, December 31, 2021 and December 31, 2020, the Company recognized PIK and non-cash interest from investments of $17,326, $23,343 and $17,002, respectively, and PIK and non-cash dividends from investments of $22,543, $19,485 and $13,447, respectively. Dividend income on common equity is recorded on the record date for private portfolio companies or on the ex-dividend date for publicly traded portfolio companies. Dividend income on preferred securities is recorded as dividend income on an accrual basis to the extent that such amounts are deemed collectible. Non-accrual income: Investments are placed on non-accrual status when principal or interest payments are past due for 30 days or more and when there is reasonable doubt that principal or interest will be collected. Accrued cash and un-capitalized PIK interest or dividends are reversed when an investment is placed on non-accrual status. Previously capitalized PIK interest or dividends are not reversed when an investment is placed on non-accrual status. Interest or dividend payments received on non-accrual investments may be recognized as income or applied to principal depending upon management’s judgment of the ultimate collectibility. Non-accrual investments are restored to accrual status when past due principal and interest is paid and, in management’s judgment, are likely to remain current. Other income: Other income represents delayed compensation, consent or amendment fees, revolver fees, structuring fees, upfront fees and other miscellaneous fees received and are typically non-recurring in nature. Delayed compensation is income earned from counterparties on trades that do not settle within a set number of business days after the trade date. Other income may also include fees from bridge loans. The Company may from time to time enter into bridge financing commitments, an obligation to provide interim financing to a counterparty until permanent credit can be obtained. These commitments are short-term in nature and may expire unfunded. A fee is received by the Company for providing such commitments. Structuring fees and upfront fees are recognized as income when earned, usually when paid at the closing of the investment, and are non-refundable.
Interest and other financing expenses | Interest and other financing expenses—Interest and other financing fees are recorded on an accrual basis by the Company.
Deferred financing costs | Deferred financing costs—The deferred financing costs of the Company consist of capitalized expenses related to the origination and amending of the Company’s borrowings. The Company amortizes these costs into expense over the stated life of the related borrowing.
Deferred offering costs | Deferred offering costs—The Company's deferred offering costs consist of fees and expenses incurred in connection with equity offerings and the filing of shelf registration statements. Upon the issuance of shares, offering costs are charged as a direct reduction to net assets. Deferred offering costs are included in other assets on the Company's Consolidated Statements of Assets and Liabilities.
Incomes taxes | Income taxes—The Company has elected to be treated, and intends to comply with the requirements to qualify annually, as a RIC under Subchapter M of the Code. As a RIC, the Company is not subject to U.S. federal income tax on the portion of taxable income and gains timely distributed to its stockholders. To continue to qualify and be subject to tax treatment as a RIC, the Company is required to meet certain income and asset diversification tests in addition to timely distributing at least 90.0% of its investment company taxable income, as defined by the Code. Since U.S. federal income tax regulations differ from GAAP, distributions in accordance with tax regulations may differ from net investment income and realized gains recognized for financial reporting purposes. Differences between taxable income and the results of operations for financial reporting purposes may be permanent or temporary in nature. Permanent differences are reclassified among capital accounts in the financial statements to reflect their tax character. Differences in classification may also result from the treatment of short-term gains as ordinary income for U.S. federal income tax purposes. For U.S. federal income tax purposes, distributions paid to stockholders of the Company are reported as ordinary income, return of capital, long term capital gains or a combination thereof. The Company will be subject to a 4.0% nondeductible U.S. federal excise tax on certain undistributed income unless the Company distributes, in a timely manner as required by the Code, an amount at least equal to the sum of (1) 98.0% of its respective net ordinary income earned for the calendar year and (2) 98.2% of its respective capital gain net income for the one-year period ending October 31 in the calendar year. Certain consolidated subsidiaries of the Company are subject to U.S. federal and state income taxes. These taxable entities are not consolidated for U.S. federal income tax purposes and may generate income tax liabilities or assets from permanent and temporary differences in the recognition of items for financial reporting and U.S. federal income tax purposes.
Distributions | Distributions—Distributions to common stockholders of the Company are recorded on the record date as set by the board of directors. The Company intends to make distributions to its stockholders that will be sufficient to enable the Company to maintain its status as a RIC. The Company intends to distribute approximately all of its net investment income (see Note 5. Agreements, for details) on a quarterly basis and substantially all of its taxable income on an annual basis, except that the Company may retain certain net capital gains for reinvestment. The Company has adopted a dividend reinvestment plan that provides for reinvestment of any distributions declared on behalf of its stockholders, unless a stockholder elects to receive cash. The Company applies the following in implementing the dividend reinvestment plan. If the price at which newly issued shares are to be credited to stockholders' accounts is equal to or greater than 110.0% of the last determined net asset value of the shares, the Company will use only newly issued shares to implement its dividend reinvestment plan. Under such circumstances, the number of shares to be issued to a stockholder is determined by dividing the total dollar amount of the distribution payable to such stockholder by the market price per share of the Company's common stock on the NASDAQ Global Select Market (the "NASDAQ") on the distribution payment date. Market price per share on that date will be the closing price for such shares on the NASDAQ or, if no sale is reported for such day, the average of their electronically reported bid and ask prices. If the price at which newly issued shares are to be credited to stockholders' accounts is less than 110.0% of the last determined net asset value of the shares, the Company will either issue new shares or instruct the plan administrator to purchase shares in the open market to satisfy the additional shares required. Shares purchased in open market transactions by the plan administrator will be allocated to a stockholder based on the average purchase price, excluding any brokerage charges or other charges, of all shares of common stock purchased in the open market. The number of shares of the Company's common stock to be outstanding after giving effect to payment of the distribution cannot be established until the value per share at which additional shares will be issued has been determined and elections of the Company's stockholders have been tabulated.
Share repurchase program | Stock repurchase program—On February 4, 2016, the Company's board of directors authorized a program for the purpose of repurchasing up to $50,000 worth of the Company's common stock (the "Repurchase Program"). Under the Repurchase Program, the Company was permitted, but was not obligated, to repurchase its outstanding common stock in the open market from time to time provided that it complied with the Company's code of ethics and the guidelines specified in Rule 10b-18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), including certain price, market volume and timing constraints. In addition, any repurchases were conducted in accordance with the 1940 Act. On December 22, 2022, the Company's board of directors extended the Company's Repurchase Program and the Company expects the Repurchase Program to be in place until the earlier of December 31, 2023 or until $50,000 of its outstanding shares of common stock have been repurchased.
Earnings per share | Earnings per share—The Company's earnings per share ("EPS") amounts have been computed based on the weighted-average number of shares of common stock outstanding for the period. Basic EPS is computed by dividing net increase (decrease) in net assets resulting from operations by the weighted average number of shares of common stock outstanding during the period of computation. Diluted EPS is computed by dividing net increase (decrease) in net assets resulting from operations by the weighted average number of shares of common stock assuming all potential shares had been issued, and its related net impact to net assets accounted for, and the additional shares of common stock were dilutive. Diluted EPS reflects the potential dilution, using the as-if-converted method for convertible debt, which could occur if all potentially dilutive securities were exercised.
Foreign securities | Foreign securities—The accounting records of the Company are maintained in U.S. dollars. Investment securities denominated in foreign currencies are translated into U.S. dollars based on the rate of exchange of such currencies on the date of valuation. Purchases and sales of investment securities and income and expense items denominated in foreign currencies are translated into U.S. dollars based on the rate of exchange of such currencies on the respective dates of the transactions. The Company isolates that portion of the results of operations resulting from changes in foreign exchange rates on investments from the fluctuations arising from changes in market prices of securities held. Such fluctuations are included with "Net change in unrealized appreciation (depreciation)" and "Net realized gains (losses)" in the Company's Consolidated Statements of Operations.
Use of estimates | Use of estimates—The preparation of the Company's consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the Company's consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Changes in the economic environment, financial markets, and other metrics used in determining these estimates could cause actual results to differ from the estimates used, and the differences could be material.
Fair value | Fair Value Pursuant to Rule 2a-5, a market quotation is readily available for purposes of Section 2(a)(41) of the 1940 Act with respect to a security only when that “quotation is a quoted price (unadjusted) in active markets for identical investments that the fund can access at the measurement date, provided that a quotation will not be readily available if it is not reliable.” Fair value is the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 establishes a fair value hierarchy that prioritizes and ranks the inputs to valuation techniques used in measuring investments at fair value. The hierarchy classifies the inputs used in measuring fair value into three levels as follows: Level I—Quoted prices (unadjusted) are available in active markets for identical investments and the Company has the ability to access such quotes as of the reporting date. The type of investments which would generally be included in Level I include active exchange-traded equity securities and exchange-traded derivatives. As required by ASC 820, the Company, to the extent that it holds such investments, does not adjust the quoted price for these investments, even in situations where the Company holds a large position and a sale could reasonably impact the quoted price. Level II—Pricing inputs are observable for the investments, either directly or indirectly, as of the reporting date, but are not the same as those used in Level I. Level II inputs include the following: •Quoted prices for similar assets or liabilities in active markets; •Quoted prices for identical or similar assets or liabilities in non-active markets (examples include corporate and municipal bonds, which trade infrequently); •Pricing models whose inputs are observable for substantially the full term of the asset or liability (examples include most over-the-counter derivatives, including foreign exchange forward contracts); and •Pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full term of the asset or liability. Level III—Pricing inputs are unobservable for the investment and include situations where there is little, if any, market activity for the investment. The inputs used to measure fair value may fall into different levels. In all instances when the inputs fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level of input that is significant to the fair value measurement in its entirety. As such, a Level III fair value measurement may include inputs that are both observable and unobservable. Gains and losses for such assets categorized within the Level III table below may include changes in fair value that are attributable to both observable inputs and unobservable inputs. The inputs into the determination of fair value require significant judgment or estimation by management and consideration of factors specific to each investment. A review of the fair value hierarchy classifications is conducted on a quarterly basis. Changes in the observability of valuation inputs may result in the transfer of certain investments within the fair value hierarchy from period to period.
Recent accounting standards updates | Recent Accounting Standards Updates In March 2020, the Financial Accounting Standards Board (the "FASB") issued ASU 2020-04, Reference Rate Reform. The amendments in ASU 2020-04 provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The standard is effective as of March 12, 2020 through December 31, 2022. Management is currently evaluating the impact of the optional guidance on the Company's consolidated financial statements and disclosures. The Company did not utilize the optional expedients and exceptions provided by ASU 2020-04 during the year ended December 31, 2022. In December 2022, the FASB issued ASU No. 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, which deferred the sunset day of this guidance to December 31, 2024. The Company is currently evaluating the impact of this guidance on its consolidated financial statements. In December 2020, the U.S. Securities and Exchange Commission (the “SEC”) adopted a rule providing a framework for fund valuation practices. Rule 2a-5 under the 1940 Act (“Rule 2a-5”) establishes requirements for determining fair value in good faith for purposes of the 1940 Act. Rule 2a-5 permits boards, subject to board oversight and certain other conditions, to designate certain parties to perform fair value determinations. Rule 2a-5 also defines when market quotations are “readily available” for purposes of the 1940 Act and the threshold for determining whether a fund must determine the fair value of a security. The SEC also adopted Rule 31a-4 under the 1940 Act (“Rule 31a-4”), which provides the recordkeeping requirements associated with fair value determinations. Finally, the SEC rescinded previously issued guidance on related issues, including the role of the board in determining fair value and the accounting and auditing of fund investments. Rule 2a-5 and Rule 31a-4 became effective on March 8, 2021, and had a compliance date of September 8, 2022. While our board of directors has not elected to designate the Investment Adviser as the valuation designee, the Company has adopted certain revisions to its valuation policies and procedures in order comply with the applicable requirements of Rule 2a-5 and Rule 31a-4.

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