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Debt - Schedule of Senior Securities (Including Debt Securities and Other Indebtedness) (Details) - Senior Notes - USD ($)
$ / shares in Units, $ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
8.25% Notes due 2020                    
Debt Instrument [Line Items]                    
Total Amount Outstanding                   $ 33,646
Asset Coverage Ratio Per Unit                   $ 6,168
Average Market Value Per Unit                   $ 1.02
GECCL Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding           $ 30,293 $ 32,631 $ 32,631 $ 32,631  
Asset Coverage Ratio Per Unit           $ 1,671 $ 1,701 $ 2,393 $ 5,010  
Average Market Value Per Unit           $ 0.89 $ 1.01 $ 1.01 $ 1.02  
GECCM Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding     $ 45,610 $ 45,610 $ 45,610 $ 45,610 $ 46,398 $ 46,398    
Asset Coverage Ratio Per Unit     $ 1,690 $ 1,544 $ 1,511 $ 1,671 $ 1,701 $ 2,393    
Average Market Value Per Unit     $ 0.99 $ 0.99 $ 1 $ 0.84 $ 1.01 $ 0.98    
GECCN Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding       $ 42,823 $ 42,823 $ 42,823 $ 45,000      
Asset Coverage Ratio Per Unit       $ 1,544 $ 1,511 $ 1,671 $ 1,701      
Average Market Value Per Unit       $ 1 $ 1 $ 0.84 $ 1      
GECCO Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding $ 57,500 $ 57,500 $ 57,500 $ 57,500 $ 57,500          
Asset Coverage Ratio Per Unit $ 1,682 $ 1,697 $ 1,690 $ 1,544 $ 1,511          
Average Market Value Per Unit $ 1 $ 0.99 $ 0.96 $ 1 $ 1.02          
GECCZ Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding   $ 40,000 $ 40,000              
Asset Coverage Ratio Per Unit   $ 1,697 $ 1,690              
Average Market Value Per Unit   $ 1.01 $ 0.99              
GECCI Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding $ 56,500 $ 56,500                
Asset Coverage Ratio Per Unit $ 1,682 $ 1,697                
Average Market Value Per Unit $ 1.01 $ 1.01                
GECCH Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding $ 41,400 $ 41,400                
Asset Coverage Ratio Per Unit $ 1,682 $ 1,697                
Average Market Value Per Unit $ 1.01 $ 1                
GECCG Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding $ 50,000                  
Asset Coverage Ratio Per Unit $ 1,682                  
Average Market Value Per Unit $ 1                  
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Total Amount Outstanding       $ 10,000            
Asset Coverage Ratio Per Unit $ 1,682 $ 1,697 $ 1,690 $ 1,544