Small-cap stocks shot higher Thursday, lifted by a strong performance for the U.S. dollar, sinking energy prices and renewed enthusiasm for technology and retail shares. At the close, the Russell 2000 (NYSE:IWM) rose 13.57, or 1.89%, to 729.75, the highest daily close since Feb. 3, the second-highest close since Jan. 3, and the fourth-highest close of the year.

The greenback climbed to the highest point against the euro since March 25, and was flirting with the highest daily close versus the yen since late February. A recovery in the dollar would suggest that the U.S. economy may have endured the worst of the slowdown, and would also increase purchasing power of foreign goods. There is also some thought that a resurgence in the dollar could trigger a massive unwinding of short dollar/long energy plays that could ignite a wave of buyers back into equities.

Clearly, the energy market was a source of enthusiasm for stock market bulls Thursday, as crude oil prices slumped to 112.55, down nearly 6% from the peak seen earlier this week as rising inventory and a strong dollar take a toll on crude values. Within the energy sector, investors were chilly to earnings from group leader Exxon Mobil Corp. (NYSE:XON), whose shares slipped about 3.4%.

Within broad market sectors, pretty much anything tied to energy or commodities was soft; with gas, oil and gold shares all down. Big losses were also seen in metals and mining stocks, which were off almost 5%. On the plus side, education services . . .

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