Consolidated Schedule of Investments - Investments (Details) (Parentheticals)	Dec. 31, 2025	Dec. 31, 2024
NAV %	203.20%	207.60%
Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	19.90%
Investment, Affiliated Issuer, Controlled [Member]
NAV %		9.50%
Investment, Unaffiliated Issuer [Member]
NAV %	183.30%	195.60%
Unrestricted Short Term Investments [Member]
NAV %	10.90%	8.10%
Restricted Short Term Investments [Member]
NAV %	0.80%	1.00%
Equity Securities [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	7.70%	0.00%
Equity Securities [Member] \| Investment, Affiliated Issuer, Controlled [Member]
NAV %		5.30%
Equity Securities [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	2.10%	2.50%
Other Investments [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	0.50%	2.50%
Other Investments [Member] \| Investment, Affiliated Issuer, Controlled [Member]
NAV %		1.90%
Other Investments [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	0.60%
Other Investments [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %		0.00%
Other Investments [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.60%
Warrant [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	0.00%	0.00%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	5.20%	5.40%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Sustainability Segment [Member]
NAV %	0.00%	0.10%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %	2.20%	1.90%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.00%	0.30%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %	3.00%	3.10%
Debt Securities [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	11.70%
Debt Securities [Member] \| Investment, Affiliated Issuer, Controlled [Member]
NAV %		2.30%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	175.40%	187.70%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Sustainability Segment [Member]
NAV %	1.50%	19.90%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %	85.20%	77.80%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	25.40%	31.00%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %	63.30%	59.00%