Consolidated Schedule of Investments - Investments (Details) (Parentheticals)	Mar. 31, 2026	Dec. 31, 2025
NAV %	208.40%	203.20%
Investment, Unaffiliated Issuer [Member]
NAV %	189.20%	183.30%
Investment, Unaffiliated Issuer [Member] \| Software Sector [Member]
NAV %		63.30%
Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	19.20%	19.90%
Unrestricted Short Term Investments [Member]
NAV %	10.80%	8.10%
Restricted Short Term Investments [Member]
NAV %	0.80%	1.00%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	181.90%	175.40%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Sustainability Segment [Member]
NAV %	1.50%	1.50%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %	97.30%	85.20%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	23.40%	25.40%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %	59.70%
Debt Securities [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	11.50%	11.70%
Investments, Other [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %		0.60%
Investments, Other [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %		0.60%
Investments, Other [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %		0.00%
Investments, Other [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	0.40%
Non Controlled Affiliate Other Investments [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %		0.50%
Equity Securities [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	1.60%	2.10%
Equity Securities [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	7.30%	7.70%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	5.00%	5.20%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Sustainability Segment [Member]
NAV %	0.00%	0.00%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %	2.10%	2.20%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.10%	0.00%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %	2.80%	3.00%
Warrant [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	0.00%	0.00%
Non Affiliate Other Investments [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	0.70%
Non Affiliate Other Investments [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.70%
Non Affiliate Other Investments [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %	0.00%