Little tiny bugs on my Mormolyca!

[OrchidLoverSA]

I need some help, I've seen these little tiny miniscule whitish bugs on the flowerstems of my Mormolyca ringens. It's only on the flowerspike and I've been removing them with a soap solution, but they just keep coming back.

Here's the funny bit though: There doesn't seem to be anything wrong with the plant, there is no damage to the flowers or flowerstems at all, in fact, the plant is happier than I've ever seen it, it's produced maby 6 flowers in the past couple of months, including 3 new growths. Also, after the initial shock I moved it back in with my other orchids, and the little bugs haven't come near any of them, and I check every time I water.

At first I thought it was just markings on the stem, but they come off when I wipe at then. Definately not aphids (too small) or thrips (wrong shape).

Any ideas? I'm stumped!