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Statements of Changes in Net Assets (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
-1x Short VIX Futures ETF    
OPERATIONS    
Net investment loss $ 42,780 $ 352,563
Net realized gain (loss) on investments and futures contracts (57,653,386) (27,980,689)
Net change in unrealized appreciation (depreciation) of investments and futures contracts (22,703,777) (4,572,697)
Net increase (decrease) in net assets resulting from operations (80,314,383) (32,200,823)
CAPITAL SHARE TRANSACTIONS    
Shares sold 304,358,978 390,239,425
Shares redeemed (101,145,822) (370,275,825)
Net increase (decrease) in net assets from capital share transactions 203,213,156 19,963,600
Total increase (decrease) in net assets 122,898,773 (12,237,223)
NET ASSETS    
Beginning of Period 212,031,300 300,123,823
End of Period 334,930,073 287,886,600
2x Long VIX Futures ETF    
OPERATIONS    
Net investment loss (372,997) 254,267
Net realized gain (loss) on investments and futures contracts 141,513,502 78,077,648
Net change in unrealized appreciation (depreciation) of investments and futures contracts 76,382,120 2,686,893
Net increase (decrease) in net assets resulting from operations 217,522,625 81,018,808
CAPITAL SHARE TRANSACTIONS    
Shares sold 386,600,768 518,833,233
Shares redeemed (646,467,579) (614,152,015)
Net increase (decrease) in net assets from capital share transactions (259,866,811) (95,318,782)
Total increase (decrease) in net assets (42,344,186) (14,299,974)
NET ASSETS    
Beginning of Period 331,291,100 187,711,259
End of Period $ 288,946,914 $ 173,411,286