NEW YORK ( TheStreet) -- Shares of Houston American Energy Corporation (AMEX: HUSA) were gapping down Thursday morning with an open price 12.1% lower than Wednesday's closing price. The stock closed at $2.23 Wednesday and opened today's trading at $1.96. The average volume for Houston American Energy has been 809,300 shares per day over the past 30 days. Houston American Energy has a market cap of $74.2 million and is part of the basic materials sector and energy industry. Shares are down 81.7% year to date as of the close of trading on Wednesday. Houston American Energy Corp. engages in the acquisition, exploration, exploitation, development, and production of natural gas and crude oil properties in the U.S. Gulf Coast region and South America. TheStreet Ratings rates Houston American Energy as a sell. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity, poor profit margins, weak operating cash flow and generally disappointing historical performance in the stock itself. You can view the full Houston American Energy Ratings Report. Get more investment ideas from our investment research center.