cheynew, it is technically possible, even one share. If one places 110 shares in the Ask and 100 are sold then 10 remain in the price point.
The underlying protocol doesn't stop you. Mostly the broker interfaces do and force you to purchase a minimum depending on the price of the instrument.
You possibly also see it because it is a SLOW holiday market.
Peregrine Pharmaceuticals the Microsoft of Biotechnology! All In My Opinion. I am not advising anything, nor accusing anyone.