Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS (Parentheticals)

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CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS (Parentheticals) - $ / shares
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]                    
Net investment income (in USD per share) $ 0.94 $ 0.76 $ 0.75 $ 0.80 $ 0.82 $ 0.84 $ 0.84 $ 0.70 $ 0.84 $ 0.12
Return of capital (in USD per share) $ 0.00 $ 0.04 $ 0.03 $ 0.01 $ 0.02 $ 0 $ 0 $ 0 $ 0 $ 0.72