Small stocks dragged under the weight of the larger selloff Thursday despite a fair amount of positive earnings news. Video-systems maker Vicon Industries ( VII) was among the winners, soaring 19% to $9.80 after the Hauppauge, N.Y., company swung to a fiscal second-quarter profit of $802,000, or 16 cents a share. Virginia-based Versar ( VSR), an infrastructure-program-management company, surged 26% to $6.60 after fiscal third-quarter earnings more than tripled from last year to 36 cents a share. Revenue more than doubled. Elsewhere in earnings news, Inter Parfums ( IPAR) added 13.4% to $27.09 in far-heavier-than-usual trading after the New York-based fragrance maker beat the first-quarter per-share earnings consensus of 23 cents by a nickel a share. Air Methods ( AIRM), of Colorado, jumped 15% to $32.88 after earning 30 cents a share in the first quarter, which trounced two analysts' 11-cent targets. And Sacramento, Calif., renewable-fuels maker Pacific Ethanol ( PEIX) squared with bottom-line estimates, lifting shares by 9% to $15.09. Away from earnings, Torch Energy Royalty Trust ( TRU), based in Delaware, surged 26% to $8.02 after Trust Venture Co. launched an $8 per-unit tender offer for all of Torch's outstanding units. Heavily on the downswing, however, was Tweeter Home Entertainment ( TWTR). Shares tanked 69.6% to 41 cents in very heavy trading after the Canton, Mass., electronics retailer reported swinging to a wide loss for the quarter ended March 31 -- $35.2 million, or $1.38 a share -- and said it might have to file for bankruptcy due to its precarious financial situation.