Snap, depends on demand I guess. Sometimes orderes inbetween bid and ask will fill. But you were on the high end of the spread. If you would have been at say .061 It may have filled.
Snap they are only required to pay the amount they are BIDDING; they are also only required to buy the amount that is shown on the bid. If the bid was 500 sh they would buy the 500 at the bid price and then drop the bid if they did not want to buy your stock.