Net Assets Investment Company, Portfolio Turnover No Trading Symbol Flag C000007401 [Member] Master Small Cap Index Series Hut 8 Corp. [Member] JFrog Ltd. [Member] Argan, Inc. [Member] BrightSpring Health Services, Inc. [Member] Cytokinetics, Inc. [Member] MaxLinear, Inc. [Member] Moog, Inc., Class A [Member] Riot Platforms, Inc. [Member] UMB Financial Corp. [Member] Viasat, Inc. [Member] Investment Type [Axis] Communication Services [Member] Energy Sector [Member] Financial Services Sector [Member] Healthcare Sector [Member] Liabilities in Excess of Other Assets [Member] Other [Member] Real Estate Sector [Member] Short-Term Securities [Member]