Someone got tired of waiting or needed his money and decided to sell without indicating a limit. When stocks are so thinly traded you must write a limit or else it easily goes back down. It is easily manipulated. 20,000 shares is meaningless.
If there is no news coming tomorrow AM, it will climb back up because it appears to be a good deal at this price. I paid more than that and I am not selling for few years. I'll look at my cash reserve and maybe will buy more.