Summary of Significant Accounting Policies - Concentrations of Portfolio Company Values Compared to the Fair Value of the Corporation's Total Investment Portfolio (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Caitec
Accounting Policies [Line Items]
Concentration risk investment portfolio	10.00%	10.00%
EFINEA
Accounting Policies [Line Items]
Concentration risk investment portfolio	10.00%	11.00%
First Coast Mulch
Accounting Policies [Line Items]
Concentration risk investment portfolio		8.00%
All About People
Accounting Policies [Line Items]
Concentration risk investment portfolio	8.00%	8.00%
FSS
Accounting Policies [Line Items]
Concentration risk investment portfolio	8.00%	8.00%
AME
Accounting Policies [Line Items]
Concentration risk investment portfolio	8.00%