<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL
STATEMENTS AND NOTES THERETO CONTAINED IN THE COMPANY'S ANNUAL REPORT AND 10-K
FILED ON MARCH 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   6-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               JUN-30-1998             DEC-31-1997
<CASH>                                           4,663                   3,840
<SECURITIES>                                       940                  11,651
<RECEIVABLES>                                   16,971                   9,191
<ALLOWANCES>                                         0                       0
<INVENTORY>                                     15,315                   7,269
<CURRENT-ASSETS>                                39,334                  33,236
<PP&E>                                          38,280                  24,925
<DEPRECIATION>                                (12,169)                (10,167)
<TOTAL-ASSETS>                                  88,067                  50,609
<CURRENT-LIABILITIES>                           20,183                   4,013
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            92                      92
<OTHER-SE>                                      49,625                  45,784
<TOTAL-LIABILITY-AND-EQUITY>                    88,067                  50,609
<SALES>                                         38,812                  59,943
<TOTAL-REVENUES>                                     0                       0
<CGS>                                           22,777                  35,032
<TOTAL-COSTS>                                        0                       0
<OTHER-EXPENSES>                                 9,464                  12,337
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 175                   (879)
<INCOME-PRETAX>                                  6,498                  14,059
<INCOME-TAX>                                     2,657                   5,589
<INCOME-CONTINUING>                              3,841                   8,470
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     3,841                   8,470
<EPS-PRIMARY>                                      .42                     .92
<EPS-DILUTED>                                      .42                     .91
        

</TABLE>