
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                       3,335,993
<SECURITIES>                                12,949,620
<RECEIVABLES>                                5,971,251
<ALLOWANCES>                                   375,389
<INVENTORY>                                  4,614,510
<CURRENT-ASSETS>                            26,888,704
<PP&E>                                      19,320,002
<DEPRECIATION>                              13,789,744
<TOTAL-ASSETS>                              33,434,830
<CURRENT-LIABILITIES>                       10,311,552
<BONDS>                                      7,904,661
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       255,633
<OTHER-SE>                                  14,573,706
<TOTAL-LIABILITY-AND-EQUITY>                33,434,830
<SALES>                                     13,577,227
<TOTAL-REVENUES>                            13,577,227
<CGS>                                       11,523,683
<TOTAL-COSTS>                               10,502,054
<OTHER-EXPENSES>                             (259,400)
<LOSS-PROVISION>                                 4,773
<INTEREST-EXPENSE>                             477,219
<INCOME-PRETAX>                            (8,671,102)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (8,671,102)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (8,671,102)
<EPS-BASIC>                                     (0.36)
<EPS-DILUTED>                                   (0.36)


</TABLE>
