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Net Assets | 12 Months Ended
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Dec. 31, 2024
Stockholders' Equity Note [Abstract] |
Net Assets | Net Assets The table below illustrates the effect of certain transactions on the net asset accounts of the Company during the years ended December 31, 2024, December 31, 2023 and December 31, 2022:
|  |  |  |  |  |  |  |  |  |  |  |  | Accumulated Overdistributed Earnings |  |  |  |  |  |
|  | Common Stock |  |  |  |  | Paid in Capital in Excess of Par |  |  | Accumulated Net Investment Income |  |  | Accumulated Net Realized Gains (Losses) |  |  | Net Unrealized Appreciation (Depreciation) |  | Total Net Assets of NMFC |  | Non-Controlling Interest in NMNLC |  | Total Net Assets
|  | Shares |  |  | Par Amount |  |  |  |  |  |  |  |  |  |  |  |
Net assets at December 31, 2021 |  | 97,907,441 |  |  |  | $ | 979 |  |  |  |  |  | $ | 1,272,796 |  |  |  | $ | 118,330 |  |  |  | $ | (92,099) |  |  |  | $ | 21,239 |  |  | $ | 1,321,245 |  |  | $ | 21,367 |  |  | $ | 1,342,612 |
Issuances of common stock |  | 3,029,585 |  |  |  | 30 |  |  |  |  |  | 41,074 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 41,104 |  |  | — |  |  | 41,104 |
Offering costs |  | — |  |  |  | — |  |  |  |  |  | (222) |  |  |  | — |  |  | — |  | — |  |  |  | — |  |  | (222) |  |  | — |  |  | (222) |
Distributions declared |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | (122,386) |  |  |  | — |  |  |  | — |  |  | (122,386) |  |  | (9,569) |  |  | (131,955) |
Contributions related to non-controlling interest in NMNLC |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |  |  | 124 |  |  | 124 |
Net increase (decrease) in net assets resulting from operations |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | 118,497 |  |  |  | 49,476 |  |  |  | (93,241) |  |  | 74,732 |  |  | (204) |  |  | 74,528 |
Tax reclassifications related to return of capital distributions (See Note 10) |  | — |  |  |  | — |  |  |  |  |  | (7,703) |  |  |  | 33,152 |  |  |  | (25,449) |  |  |  | — |  |  | — |  |  | — |  |  | — |
Net assets at December 31, 2022 |  | 100,937,026 |  |  |  | $ | 1,009 |  |  |  |  |  | $ | 1,305,945 |  |  |  | $ | 147,593 |  |  |  | $ | (68,072) |  |  |  | $ | (72,002) |  |  | $ | 1,314,473 |  |  | $ | 11,718 |  |  | $ | 1,326,191 |
Issuances of common stock |  | 1,621,833 |  |  |  | 17 |  |  |  |  |  | 21,224 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 21,241 |  |  | — |  |  | 21,241 |
Offering costs |  | — |  |  |  | — |  |  |  |  |  | (369) |  |  |  | — |  |  |  | — |  |  |  | — |  |  | (369) |  |  | — |  |  | (369) |
Distributions declared |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | (150,737) |  |  |  | — |  |  |  | — |  |  | (150,737) |  |  | (693) |  |  | (151,430) |
Net increase (decrease) in net assets resulting from operations |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | 158,918 |  |  |  | (32,841) |  |  |  | 9,266 |  |  | 135,343 |  |  | 747 |  |  | 136,090 |
Tax reclassifications related to return of capital distributions (See Note 10) |  | — |  |  |  | — |  |  |  |  |  | 4,469 |  |  |  | (5,367) |  |  |  | 898 |  |  |  | — |  |  | — |  |  | — |  |  | — |
Net assets at December 31, 2023 |  | 102,558,859 |  |  |  | $ | 1,026 |  |  |  |  |  | $ | 1,331,269 |  |  |  | $ | 150,407 |  |  |  | $ | (100,015) |  |  |  | $ | (62,736) |  |  | $ | 1,319,951 |  |  | $ | 11,772 |  |  | $ | 1,331,723 |
Issuances of common stock |  | 5,292,556 |  |  |  | 53 |  |  |  |  |  | 67,637 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 67,690 |  |  | — |  |  | 67,690 |
Other |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |  |  | 244 |  |  | 244 |
Offering costs |  | — |  |  |  | — |  |  |  |  |  | (552) |  |  |  | — |  |  |  | — |  |  |  | — |  |  | (552) |  |  | — |  |  | (552) |
Distributions declared |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | (147,193) |  |  |  | — |  |  |  | — |  |  | (147,193) |  |  | (925) |  |  | (148,118) |
Sale of non-controlling interest in NMNLC |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |  |  | (4,666) |  |  | (4,666) |
Realized gain in NMNLC |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |  |  | (1,533) |  |  | (1,533) |
Net increase (decrease) in net assets resulting from operations |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  | 145,550 |  |  |  | (41,264) |  |  |  | 9,157 |  |  | 113,443 |  |  | 1,060 |  |  | 114,503 |
Tax reclassifications related to return of capital distributions (See Note 10) |  | — |  |  |  | — |  |  |  |  |  | (32,502) |  |  |  | 32,502 |  |  |  | — |  |  |  | — |  |  | — |  |  | — |  |  | — |
Net assets at December 31, 2024 |  | 107,851,415 |  |  |  | $ | 1,079 |  |  |  |  |  | $ | 1,365,852 |  |  |  | $ | 181,266 |  |  |  | $ | (141,279) |  |  |  | $ | (53,579) |  |  | $ | 1,353,339 |  |  | $ | 5,952 |  |  | $ | 1,359,291 |
On November 3, 2021, the Company entered into an equity distribution agreement, as amended on May 18, 2023, August 23, 2023, June 27, 2024 and August 1, 2024 (the “Distribution Agreement”) with B. Riley Securities, Inc. and Raymond James & Associates, Inc. On August 1, 2024, the Company entered into Amendment No. 4 to the Distribution Agreement with B. Riley Securities, Inc., Raymond James & Associates, Inc., and Citizens JMP Securities, LLC (collectively, the "Agents") for the purpose of adding Citizens JMP Securities, LLC as an Agent. The Distribution Agreement originally provided that the Company may issue and sell its shares from time to time through the Agents, up to $250,000 worth of its common stock by means of at-the-market ("ATM") offerings. As of the amendment on June 27, 2024, the Company increased the maximum amount of shares to be sold through the ATM program from $250,000 to $400,000. For the year ended December 31, 2024, the Company sold 5,292,556 shares of common stock under the Distribution Agreement. For the same period, the Company received total accumulated net proceeds of approximately $67,691, including $12 of offering expenses, from these sales. For the year ended December 31, 2023, the Company sold 1,621,833 shares of common stock under the Distribution Agreement. For the same period, the Company received total accumulated net proceeds of approximately $21,241, including $0 of offering expenses, from these sales. For the year ended December 31, 2022, the Company sold 2,950,300 shares of common stock under the Distribution Agreement. For the same period, the Company received total accumulated net proceeds of approximately $40,007, including $439 of offering expenses, from these sales. The Company generally uses net proceeds from these offerings to make investments, to pay down liabilities and for general corporate purposes. As of December 31, 2024, December 31, 2023 and December 31, 2022, shares representing approximately $257,991, $175,694 and $196,938, respectively, of its common stock remain available for issuance and sale under the Distribution Agreement.

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