Fox's American Idol dropped barely a handful of viewers for this week's Tuesday edition as it garnered an 18.2 rating and a 26 share. With House picking up additional viewers over last week as it drew a 15.4/22, Fox once again dominated Tuesday's ratings. The only solid competition against either show came from CBS's NCIS as it scored a 10.3/15 against Idol in the 8:00 p.m. hour.