Longview Advantage US Equity ETF Active Management Risk [Member] Common Stock Risk [Member] Cyber Security Risk [Member] Derivatives Risk [Member] Equity Markets Risk [Member] ETF Risk [Member] Authorized Participants, Market Makers and Liquidity Providers Concentration Risk [Member] Secondary Market Trading Risk [Member] Shares May Trade at Prices Other Than NAV Risk [Member] Futures Contracts and Related Risks [Member] Index Futures Risk [Member] Inflation and Deflation Risk [Member] In-Kind Contribution Risk [Member] Large Shareholder Risk [Member] Market Risk [Member] New Fund Risk [Member] Profitability Investment Risk [Member] Securities Lending Risk [Member] Small-Cap and Mid-Cap Companies Risk [Member] Tax Risk [Member] Underlying Funds Risk [Member] Valuation Risk [Member] Value Investment Risk [Member] Longview Advantage Expected Return ETF Longview Advantage US Equity ETF [Member] Longview Advantage Expected Return ETF [Member] Longview Advantage US Equity ETF. Longview Advantage US Equity ETF [Member] Longview Advantage Expected Return ETF. Longview Advantage Expected Return ETF [Member] Value Investment Risk. Small-Cap and Mid-Cap Companies Risk. Securities Lending Risk. Profitability Investment Risk. New Fund Risk. Market Risk. Large Shareholder Risk. Inflation and Deflation Risk. Futures Contracts and Related Risks. Shares May Trade at Prices Other Than NAV Risk. Secondary Market Trading Risk. Authorized Participants, Market Makers and Liquidity Providers Concentration Risk. ETF Risk. Equity Markets Risk. Derivatives Risk. Cyber Security Risk. Common Stock Risk. Active Management Risk. Underlying Funds Risk. Index Futures Risk. In-Kind Contribution Risk. Tax Risk. Valuation Risk.