3.25.4 html 443 37 1 false 121 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 fp0096801-2_ncsrixbrl.htm sit-20251231.xsd fp0096801-1_63.jpg fp0096801-1_68.jpg fp0096801-1_i.jpg i0383ef6c250767f3c4684073.jpg i0a36aabdae765836e7d2c4a3.jpg i206d7f0547a3122356253882.jpg i25eb4a261a01f74b3c3c4be4.jpg i2ea889cbf16cf0ad385619e5.jpg i3a53cdea2634718fb6267ed5.jpg i44ec3441fd8b2559cfcd4406.jpg i46dc69c2ff6550a1f995f17e.jpg i5819e12a65280b1db2f70adc.jpg i69ddee84e7a565c2df89273f.jpg i6fb083cb14f0cc30e4eb7b2e.jpg i73d7ab89b8957a2b315be974.jpg i7deabe6ed149b57f2bbcdf4d.jpg i7fcc23503db6fa61528538b6.jpg i860f8504d17e94ae9c1b58fe.jpg i8b38f3bc67e6a75057208a6e.jpg i9522adf05ec7428c2758c155.jpg i95e6d321d39e2fbc307277f7.jpg i97c2a73f00cc19418f68a1fa.jpg ic0a030e012f9292572d07ae3.jpg id081ed88659db7789ed13023.jpg id82f72dda687259f01660845.jpg ida6c21eba73aab631e5a49ca.jpg ie712dc338926a20ecc36312e.jpg ie9301886a8534df88782a386.jpg ied59aaecb8884de25ff18033.jpg if538be6c67ab7641a54aa450.jpg ifa4d29735d9add6acbab7405.jpg ifa65bd7013fcd079acce84e8.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/oef/2025 false false