<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-2000 <PERIOD-END> JUN-30-2000 <CASH> 4,322,000 <SECURITIES> 0 <RECEIVABLES> 2,577,000 <ALLOWANCES> (244,000) <INVENTORY> 0 <CURRENT-ASSETS> 6,741,000 <PP&E> 89,708,000 <DEPRECIATION> (64,012,000) <TOTAL-ASSETS> 34,383,000 <CURRENT-LIABILITIES> 7,970,000 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 101,000 <OTHER-SE> 25,742,000 <TOTAL-LIABILITY-AND-EQUITY> 34,383,000 <SALES> 7,086,000 <TOTAL-REVENUES> 7,453,000 <CGS> 3,135,000 <TOTAL-COSTS> 3,135,000 <OTHER-EXPENSES> 2,198,000 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 391,000 <INCOME-PRETAX> 1,729,000 <INCOME-TAX> 0 <INCOME-CONTINUING> 1,729,000 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 1,729,000 <EPS-BASIC> 0.170 <EPS-DILUTED> 0.170