<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REGISTRANT'S BALANCE SHEET DATED AS OF DECEMBER 31, 1996, AND ITS CONSOLIDATED
STATEMENT OF OPERATIONS, CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY, AND
CONSOLIDATED STATEMENT OF CASH FLOWS FOR THE YEAR ENDED DECEMBER 31, 1996, WHICH
FINANCIAL STATEMENTS ARE INCLUDED IN ITEM 8 OF THIS REPORT, AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>

<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             JAN-01-1996             JAN-01-1996             JAN-01-1996
<PERIOD-END>                               DEC-31-1996             SEP-30-1996             JUN-30-1996             MAR-31-1996
<CASH>                                       2,214,755               4,505,284               5,930,492               6,954,138
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                7,031,596               5,563,219               5,903,030               5,782,977
<ALLOWANCES>                                   321,000                 312,000                 335,000                 311,000
<INVENTORY>                                    948,738                 991,796                 802,773                 951,219
<CURRENT-ASSETS>                            10,832,021              11,498,574              13,109,014              14,221,908
<PP&E>                                      53,360,103              49,833,174              45,553,796              43,151,665
<DEPRECIATION>                              15,584,018            (14,571,572)            (12,949,551)            (11,344,966)
<TOTAL-ASSETS>                              52,517,477              50,788,055              49,859,792              50,291,693
<CURRENT-LIABILITIES>                        5,916,581               4,431,957               3,767,075               4,975,703
<BONDS>                                      1,335,105               1,215,270               1,095,135                 960,999
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                       707,336                 706,927                 706,799                 705,924
<OTHER-SE>                                  44,558,455              44,433,901              44,290,783              43,649,067
<TOTAL-LIABILITY-AND-EQUITY>                52,517,477              50,788,055              49,859,792              50,291,693
<SALES>                                     46,150,105              33,984,238              23,179,472              12,204,455
<TOTAL-REVENUES>                            46,150,105              33,984,238              23,179,472              12,204,455
<CGS>                                       29,543,583              21,307,560              13,994,434               7,026,496
<TOTAL-COSTS>                               43,002,595              31,305,508              20,638,796              10,498,501
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                               124,382                 114,000                 134,000                  95,000
<INTEREST-EXPENSE>                              18,676                  16,193                   5,473                   2,789
<INCOME-PRETAX>                              3,398,728               2,903,678               2,683,198               1,749,731
<INCOME-TAX>                                 1,358,000               1,179,000               1,090,000                 706,000
<INCOME-CONTINUING>                          2,040,728               1,724,678               1,593,198               1,043,731
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                 2,040,728               1,724,678               1,593,198               1,043,731
<EPS-PRIMARY>                                      .29                     .25                     .23                    0.15
<EPS-DILUTED>                                      .29                     .25                     .23                    0.15


</TABLE>