Warehouse club retailer Costco Wholesale (NASDAQ: COST) has been very kind to its investors over the years. The stock has gained 52% over the last year, more than doubled in three years, and soared 712% higher in a decade, all assuming reinvested dividends along the way. Across most time frames, Costco's returns left the dividend-adjusted gains of the S&P 500 index far behind:

But all good things must come to an end, right? Is Costco running out of rocket fuel or does the stock still look like a good investment after these market-beating gains?

Let's have a look.

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Source Fool.com