Capstone Turbine Corporation (NASDAQ:CPST) reported fiscal third-quarter earnings after the market closed today and didn't do a lot to impress investors. Revenue was up 11% from a year ago to $37.0 million, falling well short of the $40.3 million Wall Street expected. Gross margin did increase to 20% from 14% a year ago, but the company still lost $2.2 million, or $0.01 per share.

Backlog increased to $160.4 million from $149.8 million in the fiscal second quarter, showing continued demand for micro-turbines. The hope for management is that the demand will allow the company to reach breakeven EBITDA, which would be an important milestone because it would end a long-running cash burn.

The challenge is that investors are expecting a lot of profit growth in the future, given the company's $508 million market cap. That's a lot to live up to, and slower-than-expected top-line growth is a concern.

With just $132.1 million in revenue in the past year, the stock is worth nearly four times sales, a hefty premium for a company that's not profitable and isn't growing terribly quickly. Shares are sliding after hours, and I'd expect that to continue unless Capstone can pick up growth and profits in coming quarters.

A top stock for the rest of this year
There's a huge difference between a good stock and a stock that can make you rich. The Motley Fool's chief investment officer has selected his No. 1 stock for 2014, and it's one of those stocks that could make you rich. You can find out which stock it is in the special free report "The Motley Fool's Top Stock for 2014." Just click here to access the report and find out the name of this under-the-radar company.

Travis Hoium and The Motley Fool have no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.