Quarterly report [Sections 13 or 15(d)]

NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details)

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NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Earnings Per Share [Abstract]    
Numerator for basic net increase (decrease) in net assets resulting from operations per common share $ 5,454 $ 26,975
Denominator basic weighted average common share (in shares) 22,593,069 22,311,501
Basic net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 0.24 $ 1.21
Adjustment for interest and amortization on 2030 Convertible Notes $ 2,529 $ 0
Numerator for diluted net increase (decrease) in net assets resulting from operations per common share $ 7,983 $ 26,975
Adjustment for dilutive effect of 2030 Convertible Notes (in shares) 5,771,806 0
Denominator for diluted weighted average common shares (in shares) 28,364,875 22,311,501
Diluted net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 0.24 $ 1.21