You should be fine. If you hear distortion turn it down a bit. Don't clip the amp and you should be fine. Either way I would bet that you couldn't overpower a speaker by 10w unless you really work at it or the speaker is terribly overrated.
Danny, This comes up quite often. Quick answer is no, you'll be fine. Actually, the higher the wattage of the amp, the cleaner the power and the less trouble you will be in. How you can really be hurt is pushing 100W speakers with a 35W amp. When amps are pushed too hard they clip (sine waves turn into square waves). Clipping is very harmful to your speakers.
Speakers actually sound best when driven almost to their breaking point, kind of like accelerating a sports car's engine just below the red line. By running an amp that's 10 watts higher than the speaker's max rating they'll sound better at lower volume levels. They should be fine. Just remember not to take them into the "red zone". That's when they become dammaged.