<ARTICLE>                     5
<MULTIPLIER>                                   1000

                             
<PERIOD-TYPE>                   6-mos
<FISCAL-YEAR-END>                              APR-30-2001
<PERIOD-START>                                 MAY-01-2000
<PERIOD-END>                                   OCT-31-2000
<CASH>                                         3701
<SECURITIES>                                   31981
<RECEIVABLES>                                  14576
<ALLOWANCES>                                   190
<INVENTORY>                                    21823
<CURRENT-ASSETS>                               74275
<PP&E>                                         36702
<DEPRECIATION>                                 24833
<TOTAL-ASSETS>                                 96018
<CURRENT-LIABILITIES>                          11242
<BONDS>                                        372
<PREFERRED-MANDATORY>                          0
<PREFERRED>                                    0
<COMMON>                                       9164
<OTHER-SE>                                     57200
<TOTAL-LIABILITY-AND-EQUITY>                   96018
<SALES>                                        19712
<TOTAL-REVENUES>                               21206
<CGS>                                          11109
<TOTAL-COSTS>                                  17653
<OTHER-EXPENSES>                               30
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                             150
<INCOME-PRETAX>                                3373
<INCOME-TAX>                                   1095
<INCOME-CONTINUING>                            2278
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   2278
<EPS-BASIC>                                    0.28
<EPS-DILUTED>                                  0.27