3.25.4 html 680 35 1 false 53 0 false 3 false false R1.htm 030000 - Disclosure - Form N-CSR Cover Sheet http://xbrl.sec.gov/oef/role/NcsrCover Form N-CSR Cover Cover 1 false false R2.htm 030001 - Disclosure - Shareholder Report Sheet http://xbrl.sec.gov/oef/role/ShareholderReport Shareholder Report Notes 2 false false R3.htm 040010 - Disclosure - Shareholder Report, Line Graph (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails Shareholder Report, Line Graph (Details) Details 3 false false R4.htm 040015 - Disclosure - Shareholder Report, Average Annual Return (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails Shareholder Report, Average Annual Return (Details) Details 4 false false R5.htm 040020 - Disclosure - Shareholder Report, Holdings (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails Shareholder Report, Holdings (Details) Details 5 false false All Reports Book All Reports nlvt-20251231.xsd tops-managedrisk_ncsr.htm i1ed0f669d06bf1857ad4e773.jpg i20647108596a033d41aaf03e.jpg i293f3ab0956b7b5793cf569a.jpg i4c7a3401d1e22a2cc4005b4b.jpg i4e85afee9114bfb2c195d639.jpg i514d657b3b082ea2e949c496.jpg i54aa0517c6038afe50fdc9c8.jpg i66fbe81a69eba4406fb2d6c6.jpg i690e70ee23fd361348f43034.jpg i7398ec884e38bc297086bd45.jpg i7a7f55066d1809a938919525.jpg i7ee20fa08bd020823a3f89a0.jpg i8b7bb46623b008a300d15c9a.jpg i94c7ba51698bd982ed975073.jpg i96f3d90da8f5299fb0502ed0.jpg i97b3e00a55b8ef5e8ead9cdf.jpg i98bd9ea0a548c3c2f5d34677.jpg i9fa2229c67863d65bd037c87.jpg ib77f5512e7425baac9e41947.jpg ic163225748c8e58f592c1fc4.jpg ic5e5385f39628e43f0e6fed9.jpg ie4e8cac3d3f390091d162523.jpg iea54bd108bde7960aac8d956.jpg to001_v1.jpg to002_v1.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/oef/2025 false false