Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net increase (decrease) in net assets resulting from operations	$ 3,486,976	$ 66,488,228	$ (103,852,603)
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Net realized (gain) loss	(1,196,573)	19,077,032	115,988,233
Net change in unrealized (appreciation) depreciation of investments	25,748,420	(65,972,678)	22,223,284
Net change in unrealized (appreciation) depreciation on Interest Rate Swap	1,332,299	0	0
Net change in unrealized (appreciation) depreciation on foreign currency translation	0	285,360	(135,427)
Interest and dividend income paid in kind	(1,914,521)	(2,589,713)	(6,541,115)
Net amortization of investment discounts and premiums	(3,418,622)	(2,487,926)	(1,300,764)
Amortization of deferred debt issuance costs	1,071,844	1,565,241	1,977,676
Amortization of original issue discount	0	942,208	890,695
Changes in assets and liabilities:
Purchase of investments	(229,891,157)	(272,247,211)	(137,077,906)
Proceeds from disposition of investments	192,448,280	250,607,406	277,596,336
Decrease (increase) in interest, dividends and fees receivable	(1,544,640)	(1,744,206)	3,650,987
Decrease (increase) in due from broker	(1,946,507)	0	0
Decrease (increase) in receivable for investments sold	678,454	4,748,957	(3,568,072)
Decrease (increase) in prepaid expenses and other assets	277,763	(379,112)	(877,792)
Increase (decrease) in payable for investments purchased	(11,079,407)	2,485,881	1,881,417
Increase (decrease) in interest and debt related payables	137,340	98,697	(254,790)
Increase (decrease) in management fees payable	64,021	(190,928)	(937,746)
Increase (decrease) in income incentive fees payable	3,233,347	(1,679,595)	0
Increase (decrease) in accrued capital gains incentive fees	(1,544,569)	1,544,569	0
Increase (decrease) in accrued administrative expenses	13,074	(4,839)	16,657
Increase (decrease) in accrued expenses and other liabilities	65,337	(1,109,062)	958,059
Net cash provided by (used in) operating activities	(23,978,841)	(561,691)	170,637,129
Financing activities
Repayment of 2022 Convertible Notes	(143,720,000)	0	0
Proceeds from issuance of 2025 Private Placement Notes	92,000,000	0	0
Draws on Credit Facility	230,000,000	137,000,000	135,800,000
Repayments of Credit Facility draws	(122,000,000)	(121,800,000)	(271,400,000)
Dividends paid to common stockholders	(29,448,663)	(22,261,033)	(22,755,572)
Repurchase of common shares	(4,884,316)	(2,192,527)	(3,627,604)
Payments of debt issuance costs	(1,187,111)	(767,459)	0
Net cash provided by (used in) financing activities	20,759,910	(10,021,019)	(161,983,176)
Net increase (decrease) in cash and cash equivalents	(3,218,931)	(10,582,710)	8,653,953
Cash and cash equivalents at beginning of period	12,750,121	23,332,831	14,678,878
Cash and cash equivalents at end of period	9,531,190	12,750,121	23,332,831
Supplemental cash flow information
Interest payments	11,038,096	8,014,632	12,322,040
Tax payments	101,056	100,050	108,050
Share issuance — conversion of 2022 Convertible Notes	30,000	0	0
Share issuance - stock distribution and reinvestment	$ 0	$ 0	$ 17,487,028