Consolidated Schedule of Investments (Unaudited) - Investments (Details) (Parentheticals)	Sep. 30, 2025	Dec. 31, 2024
NAV %	191.20%	207.60%
Unrestricted Short Term Investments [Member]
NAV %	13.90%	8.10%
Restricted Short Term Investments [Member]
NAV %	0.80%	1.00%
Investment, Affiliated Issuer, Controlled [Member]
NAV %	0.40%	9.50%
Investment, Affiliated Issuer, Controlled [Member] \| Debt Securities [Member]
NAV %	0.40%	2.30%
Investment, Affiliated Issuer, Controlled [Member] \| Equity Securities [Member]
NAV %	0.00%	5.30%
Investment, Affiliated Issuer, Controlled [Member] \| Other Investments [Member]
NAV %		1.90%
Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	14.20%
Investment, Affiliated Issuer, Noncontrolled [Member] \| Debt Securities [Member]
NAV %	8.00%
Investment, Affiliated Issuer, Noncontrolled [Member] \| Equity Securities [Member]
NAV %	5.80%	0.00%
Investment, Affiliated Issuer, Noncontrolled [Member] \| Other Investments [Member]
NAV %	0.40%	2.50%
Investment, Affiliated Issuer, Noncontrolled [Member] \| Warrant [Member]
NAV %	0.00%	0.00%
Investment, Unaffiliated Issuer [Member]
NAV %	176.60%	195.60%
Investment, Unaffiliated Issuer [Member] \| Debt Securities [Member]
NAV %	169.10%	187.70%
Investment, Unaffiliated Issuer [Member] \| Debt Securities [Member] \| Life Science Segment [Member]
NAV %	84.40%	77.80%
Investment, Unaffiliated Issuer [Member] \| Debt Securities [Member] \| Sustainability Segment [Member]
NAV %	1.50%	19.90%
Investment, Unaffiliated Issuer [Member] \| Debt Securities [Member] \| Technology Sector [Member]
NAV %	50.70%	59.00%
Investment, Unaffiliated Issuer [Member] \| Debt Securities [Member] \| Healthcare Information and Services Segment [Member]
NAV %	32.50%	31.00%
Investment, Unaffiliated Issuer [Member] \| Equity Securities [Member]
NAV %	1.70%	2.50%
Investment, Unaffiliated Issuer [Member] \| Other Investments [Member]
NAV %	0.60%
Investment, Unaffiliated Issuer [Member] \| Other Investments [Member] \| Life Science Segment [Member]
NAV %		0.00%
Investment, Unaffiliated Issuer [Member] \| Other Investments [Member] \| Technology Sector [Member]
NAV %	0.00%
Investment, Unaffiliated Issuer [Member] \| Other Investments [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.60%
Investment, Unaffiliated Issuer [Member] \| Warrant [Member]
NAV %	5.20%	5.40%
Investment, Unaffiliated Issuer [Member] \| Warrant [Member] \| Life Science Segment [Member]
NAV %	2.00%	1.90%
Investment, Unaffiliated Issuer [Member] \| Warrant [Member] \| Sustainability Segment [Member]
NAV %	0.00%	0.10%
Investment, Unaffiliated Issuer [Member] \| Warrant [Member] \| Technology Sector [Member]
NAV %	3.10%	3.10%
Investment, Unaffiliated Issuer [Member] \| Warrant [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.10%	0.30%