<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the 
unaudited Balance Sheets and unaudited Statements of Income for the three
month periods presented below and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<RESTATED> 
       
<S>                          <C>                <C>                <C>               <C>               <C>
<PERIOD-TYPE>                 3-MOS              3-MOS              3-MOS             3-MOS             3-MOS
<FISCAL-YEAR-END>             MAR-31-1998        MAR-31-1998        MAR-31-1997       MAR-31-1997       MAR-31-1997
<PERIOD-END>                  SEP-30-1997        JUN-30-1997        DEC-31-1996       SEP-30-1996       JUN-30-1996
<CASH>                          8,418,000          8,402,000          8,907,000         8,354,000         7,900,000
<SECURITIES>                            0                  0                  0                 0                 0
<RECEIVABLES>                   3,742,000          3,049,000          2,152,000         2,316,000         2,217,000
<ALLOWANCES>                      265,000            213,000            158,000           177,000           162,000
<INVENTORY>                       871,000            838,000            646,000           647,000           576,000
<CURRENT-ASSETS>               13,123,000         12,318,000         11,864,000        11,352,000        10,969,000
<PP&E>                          3,306,000          3,084,000          2,797,000         2,676,000         2,519,000
<DEPRECIATION>                  1,484,000          1,366,000          1,163,000         1,215,000         1,117,000
<TOTAL-ASSETS>                 16,886,000         15,913,000         13,498,000        12,813,000        12,371,000
<CURRENT-LIABILITIES>           1,784,000          1,989,000          1,354,000         1,297,000         1,539,000
<BONDS>                                 0                  0                  0                 0                 0
<PREFERRED-MANDATORY>                   0                  0                  0                 0                 0
<PREFERRED>                             0                  0                  0                 0                 0
<COMMON>                        7,457,000          7,189,000          6,774,000         6,742,000         6,740,000
<OTHER-SE>                      7,645,000          6,735,000          5,370,000         4,774,000         4,092,000
<TOTAL-LIABILITY-AND-EQUITY>   16,886,000         15,913,000         13,498,000        12,813,000        12,371,000
<SALES>                         7,341,000          6,296,000          4,517,000         4,939,000         4,647,000
<TOTAL-REVENUES>                7,341,000          6,296,000          4,517,000         4,939,000         4,647,000
<CGS>                           4,561,000          3,873,000          2,652,000         2,893,000         2,641,000
<TOTAL-COSTS>                   4,561,000          3,873,000          2,652,000         2,893,000         2,641,000
<OTHER-EXPENSES>                1,392,000          1,294,000          1,017,000         1,066,000         1,168,000
<LOSS-PROVISION>                        0                  0                  0                 0                 0
<INTEREST-EXPENSE>                      0                  0                  0             1,000             1,000
<INCOME-PRETAX>                 1,562,000          1,247,000            929,000         1,057,000           922,000
<INCOME-TAX>                      578,000            461,000            341,000           385,000           337,000
<INCOME-CONTINUING>               984,000            786,000            588,000           672,000           585,000
<DISCONTINUED>                          0                  0                  0                 0                 0
<EXTRAORDINARY>                         0                  0                  0                 0                 0
<CHANGES>                               0                  0                  0                 0                 0
<NET-INCOME>                      984,000            786,000            588,000           672,000           585,000
<EPS-PRIMARY>                         .31                .25                .19               .22               .19
<EPS-DILUTED>                         .29                .24                .18               .21               .18