Consolidated Schedule of Investments (Unaudited) - Investments (Details) (Parentheticals)	Mar. 31, 2025	Dec. 31, 2024
NAV %	225.70%	207.60%
Investment, Affiliated Issuer, Controlled [Member]
NAV %	4.80%	9.50%
Investment, Unaffiliated Issuer [Member]
NAV %	218.20%	195.60%
Unrestricted Short Term Investments [Member]
NAV %	13.40%	8.10%
Restricted Short Term Investments [Member]
NAV %	1.10%	1.00%
Equity Securities [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	0.00%	0.00%
Equity Securities [Member] \| Investment, Affiliated Issuer, Controlled [Member]
NAV %	2.60%	5.30%
Equity Securities [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	1.90%	2.50%
Other Investments [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	2.70%	2.50%
Other Investments [Member] \| Investment, Affiliated Issuer, Controlled [Member]
NAV %	1.70%	1.90%
Other Investments [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %	0.00%	0.00%
Warrant [Member] \| Investment, Affiliated Issuer, Noncontrolled [Member]
NAV %	0.00%	0.00%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	6.10%	5.40%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Sustainability Segment [Member]
NAV %	0.10%	0.10%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %	2.00%	1.90%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %	3.50%	3.10%
Warrant [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	0.50%	0.30%
Debt Securities [Member] \| Investment, Affiliated Issuer, Controlled [Member]
NAV %	0.50%	2.30%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member]
NAV %	210.20%	187.70%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Sustainability Segment [Member]
NAV %	21.30%	19.90%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science Segment [Member]
NAV %	93.10%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Technology Sector [Member]
NAV %	61.50%	59.00%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Software, Healthcare Information and Service [Member]
NAV %		31.00%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Healthcare Information and Services Segment [Member]
NAV %	34.30%
Debt Securities [Member] \| Investment, Unaffiliated Issuer [Member] \| Life Science [Member]
NAV %		77.80%