In the 80's, Stephen J. Cannell was churning out action shows, one right after the other, for both ABC & NBC, including The A-Team and Hunter for NBC and Hardcastle & McCormick, Tenspeed & Brown Shoe, & The Greatest American Hero for ABC.
As 1984 began, Cannell added another notch on his belt at NBC with Riptide, about a pair of Army buds (Perry King, Joe Penny) who start a detective agency after mustering out of the military. Aided by a computer whiz (Thom Bray) whom they met while in the Army, the sleuths, operating out of the titular houseboat, took on the bad guys for 3 seasons total (1984-6).
Could it have gone longer? Maybe, but halfway through the 3rd season, NBC moved the show from Tuesdays to Fridays. At that time, they parodied ABC's Moonlighting, which conceivably could've been a jump the shark point. NBC's mistake was moving it off Tuesdays, where it had stablemate A-Team as a lead-in. After Riptide was cancelled, NBC doubled down on the stupidity by moving A-Team for Fridays for its final season.
Chuck Collins supplies the intro:
Currently, reruns are airing on Get TV (check listings).