v3.25.3
Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Increase (decrease) in net assets from operations:          
Net investment loss $ (1,440) $ (1,435) $ (4,130) $ (5,399)  
Net realized gain on investment in ETC 912 896 2,554 3,782 $ 5,003
Net change in unrealized appreciation on investment in ETC 17,154 (45,236) (78,289) (29,389) 31,251
Net increase (decrease) in net assets resulting from operations 16,626 (45,775) (79,865) (31,006)  
Increase in net assets from capital share transactions:          
Shares issued 0 0 0 0  
Net increase in net assets resulting from capital share transactions 0 0 0 0  
Total increase (decrease) in net assets from operations and capital share transactions 16,626 (45,775) (79,865) (31,006)  
Net assets:          
Beginning of period 186,564 268,727 283,055 253,958 253,958
End of period $ 203,190 $ 222,952 $ 203,190 $ 222,952 $ 283,055
Change in Shares outstanding:          
Shares outstanding at beginning of period 13,993,800 13,993,800 13,993,800 13,993,800 13,993,800
Shares issued 0 0 0 0  
Net increase in Shares 0 0 0 0  
Shares outstanding at end of period 13,993,800 13,993,800 13,993,800 13,993,800 13,993,800