I'm no expert by any means, The ONLY time i've run into something like that is at a pizza place.. Looks like a Flour mite to me. however i'm no expert. I did exercise my google fu, and it tells me that Flour mites and Mould mites are related? unsure if i interpreted correctly.
Hope this helps
It also occurs to me that the source of this pest might be unexpected.. visit any sketchy pizza places in the last month or so?