OIL AND GAS INFORMATION (Details) (USD $)	12 Months Ended			60 Months Ended	96 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013
OIL AND GAS INFORMATION
Property acquisition-proved	$ 1,635,000	$ 5,413,000	$ 509,000
Exploration costs	227,000	52,000	8,147,000
Development costs	72,991,000	65,676,000	63,675,000
Total Costs related to oil and gas activities	74,853,000	71,141,000	72,331,000
Increase in asset retirement cost	1,100,000	9,500,000	5,300,000
Aggregate capitalized costs
Unproved oil and gas properties	18,015,000	20,507,000			18,015,000
Proved oil and gas properties	807,439,000	730,353,000			807,439,000
Gross capitalized costs	825,454,000	750,860,000			825,454,000
Less accumulated depreciation, depletion, amortization and impairment expense	490,100,000	449,261,000			490,100,000
Total aggregate capitalized costs relating to oil and gas activities	335,354,000	301,599,000			335,354,000
Results of operations from oil and natural gas producing activities
Revenues	127,925,000	121,797,000	103,371,000
Production costs	(36,779,000)	(33,072,000)	(30,637,000)
Accretion of asset retirement obligation	(2,256,000)	(1,525,000)	(995,000)
Depreciation, depletion, amortization	(39,431,000)	(43,460,000)	(27,914,000)
Income from oil and gas producing activities	49,459,000	43,740,000	43,825,000
Oil and gas properties not subject to amortization
Acquisition costs				834,000	834,000
Exploration costs			60,000		60,000
Development costs	126,000	311,000	161,000	16,523,000	17,121,000
Total oil and gas properties not subject to amortization	$ 126,000	$ 311,000	$ 221,000	$ 17,357,000	$ 18,015,000
Minimum
Development costs
Expected drilling period of wells	5 years
Maximum
Development costs
Expected drilling period of wells	8 years