UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Accounts receivable:
Allowance for doubtful accounts of joint interest billings	$ 237,000	$ 237,000
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)	9,817,101	9,807,101
Common stock, shares outstanding (in shares)	8,890,101	8,880,101
Treasury stock, shares (in shares)	927,000	927,000