CONSOLIDATED STATEMENT OF SHAREHOLDERS’ EQUITY/CONSOLIDATED STATEMENT OF CHANGES IN NET ASSETS - USD ($) $ in Thousands	Total	Common Shares	Additional Paid In Capital	Cumulative Net Income	Cumulative Distributions
Beginning balance (in shares) at Dec. 31, 2019	10,202,000
Ending balance (in shares) at Dec. 31, 2020	10,202,000	10,202,000
Ending balance at Dec. 31, 2020	$ 192,894	$ 10	$ 192,884	$ 0	$ 0
Investment Company, Net Assets from Operations, Increase (Decrease) [Abstract]
Net investment income	2,775
Net realized gain on investments after taxes	10,822
Net change in unrealized loss on investments	(69,278)
Distributions to preferred shareholders from net investment income	(323)
Net decrease in net assets attributable to common shares resulting from operations	(56,004)
Distributions to common shareholders from:
Distributable earnings	(6,427)
Total distributions to common shareholders	(6,427)
Capital shares transactions
Redemption of auction rate preferred shares	(16,675)
Net decrease in capital share transactions	(16,675)
Liquidation preference of preferred shares repurchased	16,675
Total decrease in net assets attributable to common shares	(62,431)
Beginning of year at Dec. 31, 2019	255,325
End of year at Dec. 31, 2020	$ 192,894
Beginning balance (in shares) at Dec. 31, 2019	10,202,000
Ending balance (in shares) at Dec. 31, 2020	10,202,000	10,202,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares (in shares)		4,285,000
Issuance of shares	$ 44,175	$ 5	44,170
Share grants (in shares)		116,000
Share grants	627		627
Share repurchases (in shares)		(6,000)
Share repurchases	(57)		(57)
Net income	24,650			24,650
Distributions	$ (4,595)				(4,595)
Ending balance (in shares) at Dec. 31, 2021	14,597,079	14,597,000
Ending balance at Dec. 31, 2021	$ 257,694	$ 15	$ 237,624	$ 24,650	$ (4,595)
Beginning balance (in shares) at Dec. 31, 2020	10,202,000	10,202,000
Ending balance (in shares) at Dec. 31, 2021	14,597,079	14,597,000