v3.26.1
Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Decrease in net assets from operations:        
Net investment loss $ (556) $ (1,179) $ (1,216) $ (2,690)
Net realized gain on investment in ETC 44 653 194 1,642
Net change in unrealized appreciation/depreciation on investment in ETC (13,606) (1,424) (49,682) (95,443)
Net decrease in net assets resulting from operations (14,118) (1,950) (50,704) (96,491)
Decrease In Net Assets From Capital Share Transactions [Abstract]        
Shares issued 0 0 0 0
Net increase in net assets resulting from capital share transactions 0 0 0 0
Total decrease in net assets from operations and capital share transactions (14,118) (1,950) (50,704) (96,491)
Net assets:        
Beginning of period 89,418 188,514 126,004 283,055
End of period $ 75,300 $ 186,564 $ 75,300 $ 186,564
Change in Shares outstanding:        
Shares outstanding at beginning of period 13,993,800 13,993,800 13,993,800 13,993,800
Shares issued 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