Consolidated Schedule of Investments (Unaudited) - Investments (Details) (Parentheticals)	Sep. 30, 2022	Dec. 31, 2021
NAV %	206.30%	186.70%
Non-affiliate [Member]
NAV %	206.20%	186.70%
Controlled Affiliate [Member]
NAV %		0.00%
Warrant [Member] \| Non-affiliate [Member]
NAV %	7.20%	8.20%
Warrant [Member] \| Non-affiliate [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.60%	0.60%
Warrant [Member] \| Non-affiliate [Member] \| Life Science Segment [Member]
NAV %	1.80%
Warrant [Member] \| Non-affiliate [Member] \| Life Science [Member]
NAV %		1.00%
Warrant [Member] \| Non-affiliate [Member] \| Sustainability Segment [Member]
NAV %	0.50%	0.40%
Warrant [Member] \| Non-affiliate [Member] \| Technology Segment [Member]
NAV %	4.20%	6.20%
Other Long-Term Investments [Member] \| Non-affiliate [Member]
NAV %	0.40%	0.10%
Other Long-Term Investments [Member] \| Controlled Affiliate [Member] \| Biotechnology Sector [Member]
NAV %		0.00%
Equity Securities [Member] \| Non-affiliate [Member]
NAV %	0.70%	0.10%
Unrestricted Short Term Investments [Member]
NAV %	2.50%	3.20%
Restricted Short Term Investments [Member]
NAV %	0.50%	0.60%
Debt Securities [Member] \| Non-affiliate [Member]
NAV %		178.30%
Debt Securities [Member] \| Non-affiliate [Member] \| Healthcare Information and Services Segment [Member]
NAV %	10.00%
Debt Securities [Member] \| Non-affiliate [Member] \| Life Science Segment [Member]
NAV %		77.30%
Debt Securities [Member] \| Non-affiliate [Member] \| Sustainability Segment [Member]
NAV %		18.80%
Debt Securities [Member] \| Non-affiliate [Member] \| Technology Segment [Member]
NAV %		77.20%
Debt Investments [Member] \| Non-affiliate [Member]
NAV %	179.90%
Debt Investments [Member] \| Non-affiliate [Member] \| Healthcare Information and Services Segment [Member]
NAV %		5.00%
Debt Investments [Member] \| Non-affiliate [Member] \| Life Science Segment [Member]
NAV %	83.00%
Debt Investments [Member] \| Non-affiliate [Member] \| Sustainability Segment [Member]
NAV %	24.70%
Debt Investments [Member] \| Non-affiliate [Member] \| Technology Segment [Member]
NAV %	80.20%