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Common Stock, Shares, Issued Maximum borrowing capacity, increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Kahala Aviation Holdings, LLC and Kahala Aviation US, Inc. Kahala Aviation Holdings, LLC and Kahala Aviation US, Inc. [Member] Kahala Aviation Holdings, LLC and Kahala Aviation US, Inc. Use of Estimates Use of Estimates, Policy [Policy Text Block] Due from broker Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Upfront Payments/Receipts Payments for (Proceeds from) Derivative Instrument, Financing Activities Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Voting securities percentage (more than) Investment Company, Voting Securities, Percentage Investment Company, Voting Securities, Percentage Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Total liabilities Total Liabilities Liabilities Aggregate borrowing capacity Total Aggregate Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Reinvested dividends (in shares) Shares issued through DRIP (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Accrual of Series A redeemable convertible preferred stock distributions (in dollars per share) Investment Company, Temporary Equity, Adjustments From Stock Distributions, Per Share Investment Company, Temporary Equity, Adjustments From Stock Distributions, Per Share Share repurchases (in shares) Shares Repurchased (in shares) Stock Repurchased During Period, Shares Operating expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 2029 Notes 2029 Notes 2029 Notes [Member] 2029 Notes Asset Class [Domain] Asset Class [Domain] Weighted average annualized interest cost percentage Line of Credit Facility, Interest Rate During Period Cash and other assets Cash And Other Assets Cash And Other Assets Net realized gain (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Amount Increase (Decrease) in Temporary Equity [Roll Forward] Equity/Other Other Security Investments [Member] Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Distributed Earnings [Abstract] Subsequent Event [Line Items] Subsequent Event [Line Items] Total investment income Total investment income Gross Investment Income, Operating Common stock activity (in shares) Stock Issued During Period, Shares, Period Increase (Decrease) Common Stock Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation