Pre-market: NightHawk Radiology Holdings, School Specialty and Hoku Scientific lead small-cap volume

NightHawk Radiology Holdings, Inc. (Nasdaq: NHWK), School Specialty, Inc. (Nasdaq: SCHS) and Hoku Scientific, Inc. (Nasdaq: HOKU) are among the most actively traded companies in Tuesday's pre-market trading among those with market capitalizations under $750 million:
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