<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED STATEMENT OF INCOME FOR THE YEAR ENDED JUNE 30, 1998 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               JUN-30-1998
<CASH>                                         755,904
<SECURITIES>                                19,332,801
<RECEIVABLES>                                1,823,468
<ALLOWANCES>                                   205,318
<INVENTORY>                                    662,399
<CURRENT-ASSETS>                            47,220,556
<PP&E>                                      33,989,277
<DEPRECIATION>                              23,304,941
<TOTAL-ASSETS>                              78,380,114
<CURRENT-LIABILITIES>                        3,591,042
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                     4,138,462
<OTHER-SE>                                  67,015,610
<TOTAL-LIABILITY-AND-EQUITY>                78,380,114
<SALES>                                     20,448,167
<TOTAL-REVENUES>                            25,045,272
<CGS>                                       14,536,956
<TOTAL-COSTS>                               24,146,292
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                             26,243,797
<INCOME-TAX>                                10,180,000
<INCOME-CONTINUING>                         16,063,797
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                16,063,797
<EPS-PRIMARY>                                    14.10
<EPS-DILUTED>                                    13.98