American Ecology ( ECOL) climbed after the industrial waste-management company beat Wall Street's first-quarter earnings expectations. The company posted income of $4.2 million, or 23 cents a share, compared with $856,000, or 5 cents a share, a year ago.

Revenue increased 71% to $21.5 million. Analysts polled by Thomson First Call were looking for earnings of 15 cents. Shares advanced $2.94, or 14.4%, to $23.31 in recent trading.

Rush Enterprises ( RUSHB) gained after the transportation and construction equipment retailer surpassed analysts' first-quarter earnings expectations. Revenue rose 23.9% to $497.9 million. Earnings rose to $11.6 million, or 46 cents a share, from $7.7 million, or 31 cents a share, a year ago.

Analysts were looking for the company to post earnings of 41 cents a share. Shares of Rush rose $1.14, or 6.5%, to $18.56.

Stanley Furniture ( STLY) fell after the company missed the consensus first-quarter earnings estimate. The company earned $5.4 million, or 43 cents a share, compared with $5.8 million and 43 cents a share last year. Revenue totaled $83.5 million, up from $83 million a year ago.

Analysts were looking for earnings of 45 cents on revenue of $82.6 million. For the quarter ending July 1, net sales are expected to be in the range of $79.5 million to $82 million, a decrease of 2% to 5% from a year ago. Stanley projected earnings of 35 cents to 38 cents a share, down from 44 cents last year.

For the full year, sales should be $335 million to $345 million, up 0.4% to 3.4% from 2005, Stanley said. Earnings will probably be in the range of $1.78 to $1.84, compared with $1.77 for last year. Shares sank $1.96, or 7%, to $26.14.

Bottomline Technologies ( EPAY) plummeted after the financial software provider lowered its third-quarter expectations. The company said it estimates earnings of 4 cents to 7 cents a share on revenue of $24.5 million to $25 million. Analysts are calling for a profit of 13 cents a share on revenue of $27.2 million.

Bottomline blamed a decrease in software license sales as one of the reasons behind the shortfall. Shares fell $2.37, or 17.4%, to $11.22.

Taser International ( TASR) advanced after the stun-gun maker said it received a $585,000 order for 713 Taser X26 devices and accessories from the Charlotte-Mecklenburg Police in North Carolina.

The company expects to ship the order in the second quarter. Shares of Taser gained 34 cents, or 3.3%, to $10.63.