<ARTICLE> 5
       
                                                  
<PERIOD-TYPE>                   3-MOS                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1998             MAR-31-1998
<PERIOD-END>                               MAR-31-1998             MAR-31-1998
<CASH>                                       5,523,416               5,523,416
<SECURITIES>                                         0                       0
<RECEIVABLES>                                7,395,086               7,395,086
<ALLOWANCES>                                   278,495                 278,495
<INVENTORY>                                  2,783,070               2,783,070
<CURRENT-ASSETS>                            16,536,186              16,536,186
<PP&E>                                      55,809,950              55,809,950
<DEPRECIATION>                              22,235,256              22,235,256
<TOTAL-ASSETS>                              51,158,162              51,158,162
<CURRENT-LIABILITIES>                        9,900,591               9,900,591
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                        44,640                  44,640
<OTHER-SE>                                  37,721,692              37,721,692
<TOTAL-LIABILITY-AND-EQUITY>                37,766,332              37,766,332
<SALES>                                     12,992,054              46,721,054
<TOTAL-REVENUES>                            12,992,054              46,721,054
<CGS>                                        8,439,531              29,744,531
<TOTAL-COSTS>                                8,439,531              29,744,531
<OTHER-EXPENSES>                                     0                (254,014)
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                              2,681,064               9,788,064
<INCOME-TAX>                                   999,564               3,687,564
<INCOME-CONTINUING>                          1,681,501               6,100,501
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                 1,681,501               6,100,501
<EPS-PRIMARY>                                     0.38                    1.37<F1>
<EPS-DILUTED>                                     0.34                    1.25
<FN>
<F1>For Purposes of This Exhibit, Primary means Basic.
</FN>