UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Accounts receivable:
Allowance for doubtful accounts of joint interest billings	$ 174,000	$ 174,000
STOCKHOLDERS' EQUITY:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	9,062,385	9,052,385
Common stock, shares outstanding (in shares)	8,135,385	8,125,385
Treasury stock, shares (in shares)	927,000	927,000