Summary of Significant Accounting Policies - Schedule of Company's Investment (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Total	$ 1,665,730,102	$ 1,609,587,641
Bank Debt
Marketable Securities [Line Items]
Debt	1,400,988,976	1,350,560,564
Other Corporate Debt
Marketable Securities [Line Items]
Debt	69,742,383	69,867,175
Equity Securities
Marketable Securities [Line Items]
Equity Securities	194,998,743	189,159,902
Level 1
Marketable Securities [Line Items]
Total	769,671	781,051
Level 1 | Bank Debt
Marketable Securities [Line Items]
Debt	0	0
Level 1 | Other Corporate Debt
Marketable Securities [Line Items]
Debt	0	0
Level 1 | Equity Securities
Marketable Securities [Line Items]
Equity Securities	769,671	781,051
Level 2
Marketable Securities [Line Items]
Total	91,302,599	91,977,164
Level 2 | Bank Debt
Marketable Securities [Line Items]
Debt	91,302,599	91,977,164
Level 2 | Other Corporate Debt
Marketable Securities [Line Items]
Debt	0	0
Level 2 | Equity Securities
Marketable Securities [Line Items]
Equity Securities	0
Level 3 | Independent Third-Party Valuation
Marketable Securities [Line Items]
Total	1,572,424,149	1,514,008,603
Level 3 | Valuation Designee
Marketable Securities [Line Items]
Total	1,233,683
Level 3 | Advisor Valuations
Marketable Securities [Line Items]
Total		2,820,823
Level 3 | Bank Debt | Independent Third-Party Valuation
Marketable Securities [Line Items]
Debt	1,309,686,377	1,258,052,376
Level 3 | Bank Debt | Valuation Designee
Marketable Securities [Line Items]
Debt	0
Level 3 | Bank Debt | Advisor Valuations
Marketable Securities [Line Items]
Debt		531,024
Level 3 | Other Corporate Debt | Independent Third-Party Valuation
Marketable Securities [Line Items]
Debt	69,351,439	68,451,437
Level 3 | Other Corporate Debt | Valuation Designee
Marketable Securities [Line Items]
Debt	390,944
Level 3 | Other Corporate Debt | Advisor Valuations
Marketable Securities [Line Items]
Debt		1,415,738
Level 3 | Equity Securities | Independent Third-Party Valuation
Marketable Securities [Line Items]
Equity Securities	193,386,333	187,504,790
Level 3 | Equity Securities | Valuation Designee
Marketable Securities [Line Items]
Equity Securities	$ 842,739
Level 3 | Equity Securities | Advisor Valuations
Marketable Securities [Line Items]
Equity Securities		$ 874,061