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Net Asset Value and Financial Highlights (Details Textual)
Mar. 31, 2021
Sit Rising Rate ETF [Member]  
Net Asset Value and Financial Highlights (Textual)  
Percentage of fund expenses capped 1.00%
Breakwave Dry Bulk Shipping ETF [Member]  
Net Asset Value and Financial Highlights (Textual)  
Percentage of fund expenses capped 3.50%