Major Precious Metals Producers [Member] Other Natural Resources Companies [Member] Junior Precious Metals Producers [Member] Intermediate Precious Metals Producers [Member] McEwen Inc [Member] B2Gold Corp [Member] Wheaton Precious Metals Corp [Member] G Mining Ventures Corp [Member] Endeavour Mining plc [Member] Aura Minerals Inc [Member] IAMGOLD Corp [Member] Evolution Mining Limited [Member] SSR Mining Inc [Member] DPM Metals Inc [Member] C000032073 [Member] Midas Discovery UNITED STATES UNITED KINGDOM CANADA AUSTRALIA Financial Services Sector [Member] Technology Sector [Member] C000119766 [Member] Midas Special Opportunities Alphabet Inc Class A [Member] Lam Research Corporation [Member] Mastercard Inc Class A [Member] Williams Sonoma Inc [Member] JPMorgan Chase And Co [Member] Constellation Software Inc [Member] Berkshire Hathaway Inc Class B [Member] Microsoft Corp [Member] The Progressive Corporation [Member] Qualys Inc [Member] Consumer Cylical [Member] Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag