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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
-1x Short VIX Futures ETF    
CASH FLOW FROM OPERATING ACTIVITIES    
Net increase (decrease) in net assets resulting from operations $ (80,314,383) $ (32,200,823)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities    
Purchase of investments (2,148,257) (309,357,715)
Proceeds from sales or maturities of investments held 2,160,271 310,243,297
Net realized gain/loss on investments in options 119,483 1,518,833
Net change in unrealized appreciation/depreciation on investments in options 316,703 (90,533)
Decrease (Increase) in Deposits at broker for futures and options contracts (3,121,565) 51,878,887
Decrease (Increase) in Variation margin receivable (29,193,177) (1,471,674)
Decrease (Increase) in interest receivable (45,287) (31,797)
Decrease (Increase) in other receivables 946 (1,144)
Decrease (Increase) in Prepaid expenses and other assets (9,962)
Increase (Decrease) in Variation margin payable (2,218,776) (3,655,035)
Increase (Decrease) in Payable to Sponsor (2,051) 24,055
Increase (Decrease) in Administrative, accounting and custodian fees payable 6,675 37,743
Increase (Decrease) in Professional fees payable 134,823 (63,044)
Increase (Decrease) in Licensing and registration fees payable 35,049 40,192
Net cash provided by (used in) operating activities (114,269,546) 16,861,280
CASH FLOW FROM FINANCING ACTIVITIES    
Proceeds from shares sold, net of receivable for shares sold 304,358,978 369,920,125
Cost of shares redeemed, net of payable for shares redeemed (104,299,908) (386,781,405)
Net cash provided by (used in) financing activities 200,059,070 (16,861,280)
NET INCREASE (DECREASE) IN CASH 85,789,524
Beginning of Period 62,207,349
End of Period 147,996,873
2x Long VIX Futures ETF    
CASH FLOW FROM OPERATING ACTIVITIES    
Net increase (decrease) in net assets resulting from operations 217,522,625 81,018,808
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities    
Purchase of investments   (346,744,537)
Proceeds from sales or maturities of investments held   331,823,198
Net realized gain/loss on investments in options
Net change in unrealized appreciation/depreciation on investments in options
Decrease (Increase) in Deposits at broker for futures and options contracts 61,423,827 5,556,301
Decrease (Increase) in Variation margin receivable 6,528,043 4,152,478
Decrease (Increase) in interest receivable 12,956 7,633
Decrease (Increase) in other receivables (4,291) (4,894)
Decrease (Increase) in Prepaid expenses and other assets (12,564)
Increase (Decrease) in Variation margin payable 64,933,436 2,191,128
Increase (Decrease) in Payable to Sponsor 22,094 (130,791)
Increase (Decrease) in Administrative, accounting and custodian fees payable (124) 6,095
Increase (Decrease) in Professional fees payable 141,782 (78,565)
Increase (Decrease) in Licensing and registration fees payable 75,544 30,822
Net cash provided by (used in) operating activities 350,655,892 77,815,112
CASH FLOW FROM FINANCING ACTIVITIES    
Proceeds from shares sold, net of receivable for shares sold 372,297,908 518,833,233
Cost of shares redeemed, net of payable for shares redeemed (646,467,579) (597,837,782)
Net cash provided by (used in) financing activities (274,169,671) (79,004,549)
NET INCREASE (DECREASE) IN CASH 76,486,221 (1,189,437)
Beginning of Period 62,568,088 1,189,437
End of Period $ 139,054,309