Westwood Salient Enhanced Power & Infrastructure ETF Equity Securities Risk [Member] Industry Specific Risk [Member] Mlps Risk [Member] Covered Call Strategy Risk [Member] Flex Options Risk [Member] Concentration Risk [Member] Preferred Stock Risk [Member] Largecapitalization Company Risk [Member] Small And Mid Capitalization Company Risk [Member] Etf Risks [Member] Liquidity Risk [Member] Market Risk [Member] Counterparty Risk [Member] Management Risk [Member] Market Events Risk Events In U [Member] Foreign Securities Risk [Member] Developed Markets Risk [Member] Depositary Receipts [Member] Currency Risk [Member] Nondiversification Risk [Member] Options Risk [Member] Tax Law Change Risk [Member] Westwood Salient Enhanced Power & Infrastructure ETF Westwood Salient Enhanced Power & Infrastructure ETF [Default Label]