<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AT MARCH 31, 1998 AND THE CONSOLIDATED STATEMENT OF
INCOME FOR THE NINE MONTHS ENDED MARCH 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               MAR-31-1998
<CASH>                                       4,484,798
<SECURITIES>                                32,806,319
<RECEIVABLES>                                3,034,605
<ALLOWANCES>                                   176,769
<INVENTORY>                                    467,127
<CURRENT-ASSETS>                            41,503,498
<PP&E>                                      33,498,496
<DEPRECIATION>                              23,065,230
<TOTAL-ASSETS>                              85,806,504
<CURRENT-LIABILITIES>                        6,177,523
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                     4,138,462
<OTHER-SE>                                  69,240,519
<TOTAL-LIABILITY-AND-EQUITY>                85,806,504
<SALES>                                     15,775,574
<TOTAL-REVENUES>                            19,205,177
<CGS>                                       11,098,539
<TOTAL-COSTS>                               18,377,027
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                             14,633,647
<INCOME-TAX>                                 5,665,000
<INCOME-CONTINUING>                          8,968,647
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 8,968,647
<EPS-PRIMARY>                                     7.84<F1>
<EPS-DILUTED>                                     7.78
<FN>
<F1>The term "Primary" should read as "Basic".
</FN>