Actually I also have purchased this stock like 2 months ago. And the stock price has almost double. I also wonder when is the appropriate time to sell it. I found something valuable for our reference:
(
http://www.aastocks.com/chi/stockquote/dsnapshot.asp?symbol=0193)
When you refer to the chart of this stock, u will c that this stock fluctuates a lot in its history. So, in order to keep you money safe there are 2 advise for u:
1) To set a Two Way Limit to sell the stock. Set the target Stop Loss Price, say $014 and also set the Lowest Selling Price that you feel comfortable (say, $0.18). Don't think this stock can rise forever.
2) Sell part of the stock on hand. This is what I gonna do. I will sell half of the stock on hand when it rise up the certain level, say when it doubled. Then you get you money back and use your profit to roll it up. Risk is lower, and so as the profit.