Investing in companies with sub-$1 billion market caps can be a tricky business. After all, if it were easy to figure out what stocks are destined to be future mid-cap or even large-cap stocks, we'd all be rich.

Having said that, there are some that look extremely attractive from the perspective of a long-term investor. Both of these companies have massive market opportunities to pursue as well as management teams with ambitious visions for the future. Here's a bit about each one, and why you might want to put them on your radar.

Boston Omaha Corporation (NYSE: BOC) is a very small business right now in the context of publicly traded companies, with a market cap of just $532 million. But management has big ambitions.

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Source Fool.com