v3.26.1
Investments - Schedule of Transactions with Affiliated Investments and Controlled Investments (Details) - USD ($)
 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] $ 35,381,405 $ 14,750,785
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 2,434,292 8,289
Transfers In/(Out) of Controlled [1],[2]
Unrealized Gain/(Loss) [1],[2] (1,043,189) (981,553)
Realized Gain/(Loss) [1],[2] 3,496
Fair value as of ending [1],[2] 36,776,004 13,777,521
Earned Income [1],[2] 2,020,927 254,231
Fee/Other Income [1],[2]
Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 121,610,914 70,931,647
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 7,689,883 53,537,545
Transfers In/(Out) of Controlled [1],[2]
Unrealized Gain/(Loss) [1],[2] (299,405) (1,807,602)
Realized Gain/(Loss) [1],[2]
Fair value as of ending [1],[2] 129,001,392 122,661,590
Earned Income [1],[2] 3,078,522 4,194,951
Fee/Other Income [1],[2] 329,831
Advocates for Disabled Vets, LLC (dba Reps for Vets) [Member] | Senior Secured First Lien Term Loan [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 8,798,513  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] (23,545)  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (125,526)  
Realized Gain/(Loss) [1],[2] 1,171  
Fair value as of ending [1],[2] 8,650,613  
Earned Income [1],[2] 545,661  
Fee/Other Income [1],[2]  
Advocates for Disabled Vets, LLC (dba Reps for Vets) [Member] | Equity [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 3,359,511  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (561,187)  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 2,798,324  
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
FST Holdings Parent, LLC [Member] | Equity [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 10,960,741  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] 1,224,663  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 12,185,404  
Earned Income [1],[2] 268,540  
Fee/Other Income [1],[2]  
MB Precision Investment Holdings LLC [Member] | Senior Secured First Lien Term Loan [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 6,398,561  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] (45,310)  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (231,879)  
Realized Gain/(Loss) [1],[2] 2,325  
Fair value as of ending [1],[2] 6,123,697  
Earned Income [1],[2] 485,033  
Fee/Other Income [1],[2]  
MB Precision Investment Holdings LLC [Member] | Equity [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 2,725,408  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 427,146  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (459,723)  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 2,692,831  
Earned Income [1],[2] 427,146  
Fee/Other Income [1],[2]  
MB Precision Investment Holdings LLC [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 490,306  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 1,408,804  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (112,984)  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 1,786,126  
Earned Income [1],[2] 106,789  
Fee/Other Income [1],[2]  
MB Precision Investment Holdings LLC [Member] | Senior Secured First Lien Revolver [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 1,975,347  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 93,394  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (80,612)  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 1,988,129  
Earned Income [1],[2] 187,758  
Fee/Other Income [1],[2]  
MB Precision Investment Holdings LLC [Member] | Senior Secured 6th Amendment Term Loan [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 573,803  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (22,923)  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 550,880  
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
MB Precision Investment Holdings LLC [Member] | Warrants [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 673,018  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] (673,018)  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]  
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
ECC Capital Corp [Member] | Senior Secured First Lien Term Loan [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 6,997,012 7,422,012
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]
Transfers In/(Out) of Controlled [1],[2]
Unrealized Gain/(Loss) [1],[2]
Realized Gain/(Loss) [1],[2]
Fair value as of ending [1],[2] 6,997,012 7,422,012
Earned Income [1],[2] 324,446 391,510
Fee/Other Income [1],[2]
ECC Capital Corp [Member] | Equity [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 6,636,000  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] 3,024,000  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 9,660,000  
Earned Income [1],[2]  
Fee/Other Income [1],[2] 79,831  
ECC Capital Corp [Member] | Equity [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]   4,872,000
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]   159,600
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]   5,031,600
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
FlexFIN, LLC [Member] | Equity Interest [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 37,180,761  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] (384,417)  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 36,796,344  
Earned Income [1],[2] 1,907,359  
Fee/Other Income [1],[2]  
NSG Captive, Inc. [Member] | Equity [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 48,469,540  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 6,474,300  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2] 411,853  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 55,355,693  
Earned Income [1],[2]  
Fee/Other Income [1],[2] 250,000  
NSG Captive, Inc. [Member] | Equity [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]   101,000
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]   49,145,255
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]   (849,113)
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]   48,397,142
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
NVTN LLC [Member] | Senior Secured First Lien Term Loan [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]  
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
NVTN LLC [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 8,900,000 5,500,000
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 950,000 4,300,000
Transfers In/(Out) of Controlled [1],[2]
Unrealized Gain/(Loss) [1],[2] (49,250)
Realized Gain/(Loss) [1],[2]
Fair value as of ending [1],[2] 9,800,750 9,800,000
Earned Income [1],[2] 518,544 294,649
Fee/Other Income [1],[2]
NVTN LLC [Member] | Senior Secured First Lien Term Loan B [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2] 13,427,601 16,353,590
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]
Transfers In/(Out) of Controlled [1],[2]
Unrealized Gain/(Loss) [1],[2] (3,686,008) (1,118,089)
Realized Gain/(Loss) [1],[2]
Fair value as of ending [1],[2] 9,741,593 15,235,501
Earned Income [1],[2] 315,797 528,826
Fee/Other Income [1],[2]
NVTN LLC [Member] | Senior Secured Revolving Note [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]  
Purchases/(Sales) of or Advances/ (Distributions) [1],[2] 650,000  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2] 650,000  
Earned Income [1],[2] 12,376  
Fee/Other Income [1],[2]  
Black Angus Steakhouses, LLC [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]   751,207
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]   (302,288)
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]   448,919
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
Black Angus Steakhouses, LLC [Member] | Senior Secured First Lien Super Priority DDTL [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]   1,647,776
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]  
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]   (663,070)
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]   984,706
Earned Income [1],[2]  
Fee/Other Income [1],[2]  
FST Holdings Parent, LLC [Member] | Equity [Member] | Affiliated Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]   12,351,802
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]   8,289
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]   (16,195)
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]   12,343,896
Earned Income [1],[2]   254,231
Fee/Other Income [1],[2]  
FlexFIN, LLC [Member] | Equity Interest [Member] | Controlled Investments [Member]    
Affiliated Investments    
Fair value as of beginning [1],[2]   36,683,045
Purchases/(Sales) of or Advances/ (Distributions) [1],[2]   92,290
Transfers In/(Out) of Controlled [1],[2]  
Unrealized Gain/(Loss) [1],[2]  
Realized Gain/(Loss) [1],[2]  
Fair value as of ending [1],[2]   36,775,335
Earned Income [1],[2]   2,979,966
Fee/Other Income [1],[2]  
[1] Securities with a zero value at the beginning and end of the period, and those that had no transaction activity were excluded from the roll forward.
[2] The par amount and additional detail are shown in the Consolidated Schedules of Investments.