0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Statement - Consolidated Statements of Assets and Liabilities link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - Consolidated Statements of Assets and Liabilities (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - Consolidated Statements of Changes in Net Assets link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 0000007 - Statement - Consolidated Schedule of Investments link:presentationLink link:calculationLink link:definitionLink 0000007 - Statement - Consolidated Schedule of Investments link:presentationLink link:calculationLink link:definitionLink 0000008 - Statement - Consolidated Schedule of Investments (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000008 - Statement - Consolidated Schedule of Investments (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000009 - Statement - Consolidated Schedule of Investments (Derivative Instruments) link:presentationLink link:calculationLink link:definitionLink 0000009 - Statement - Consolidated Schedule of Investments (Derivative Instruments) link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - Formation and Business Purpose link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Fair Value link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Agreements link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Related Parties link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Borrowings link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - Regulation link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - Net Assets link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - Earnings (Loss) Per Share link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - Financial Highlights link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - Recent Accounting Standards Updates link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - Segment Reporting link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Fair Value (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Agreements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Borrowings (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Net Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Earnings (Loss) Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Financial Highlights (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Formation and Business Purpose (Details) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Summary of Significant Accounting Policies - Schedule of Property Information for NMNLC (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Summary of Significant Accounting Policies - Schedule of Current Income Tax Expense (Benefit), Deferred Income Tax (Benefit) Provision and Total Income Tax (Benefit) Provision (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Investments - Investment Cost and Fair Value by Type and by Industry (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Investments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Investments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Investments - PPVA Black Elk (Equity) LLC (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Investments - PPVA Black Elk (Equity) LLC (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Investments - NMFC Senior Loan Program III LLC (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Investments - NMFC Senior Loan Program III LLC (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Investments - Portfolio Summary for SLP III and SLP IV (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Investments - Portfolio Summary for SLP III and SLP IV (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Investments - Individual Investments in the Portfolios of SLP III (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Investments - Individual Investments in the Portfolios of SLP III (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Investments - Selected Balance Sheet Information and Selected Statement of Operations Information for SLP III and SLP IV (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Investments - NMFC Senior Loan Program IV LLC (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Investments - NMFC Senior Loan Program IV LLC (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Investments - Individual Investments in the Portfolios of SLP IV (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Investments - Individual Investments in the Portfolios of SLP IV (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Fair Value - Schedule of Portfolio Investments by Levels in the Fair Value Hierarchy (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Fair Value - Schedule of Changes in Fair Value of Level III Portfolio Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Fair Value - Schedule of Changes in Fair Value of Level III Portfolio Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Fair Value - Schedule of Unobservable Inputs Used in the Fair Value Measurement (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Fair Value - Schedule of Principal Amounts and Fair Values of the Company’s Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Fair Value - Schedule of Notional Amounts and Fair Values of the Company's Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Agreements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Agreements - Schedule of Management Fees and Incentive Fees Incurred by the Company (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Related Parties (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Related Parties (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Borrowings - General, Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Borrowings - Holdings Credit Facility (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Borrowings - NMFC Credit Facility (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Borrowings - Unsecured Management Company Revolver (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Borrowings - Convertible Notes, Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Borrowings - Convertible Notes, Other Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Borrowings - Unsecured Notes (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Borrowings - Effect of Hedging Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Borrowings - SBA-Guaranteed Debentures, Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Borrowings - Summary of SBA-Guaranteed Debentures (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Borrowings - SBA-Guaranteed Debentures, Other Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Net Assets - Schedule of Net Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Net Assets - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Earnings (Loss) Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Financial Highlights (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Segment Reporting (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink