SEGMENTS AND MAJOR CUSTOMERS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments													2
Segment Reporting Information, Results of operations [Abstract]
Revenues													$ 32,379	$ 33,647	$ 32,534
Total operating expenses													28,308	32,965	33,769
Total interest expenses													368	276	193
Operating income (loss) from identified segments	(3,203)	(681)	769	627	581	403	151	(6,125)	(5,898)	(2,675)	(957)	(679)	(2,488)	(4,846)	(10,209)
General and administrative expenses													(6,559)	(5,673)	(9,109)
Add back Interest expenses													368	276	193
Other revenues and expenses													397	(2,695)	849
(Loss) before income taxes and discontinued operations	(2,334)	(63)	56	250	(1,217)	(706)	367	(6,130)	(6,079)	(3,155)	624	(833)	(2,091)	(7,686)	(9,495)
Depreciation depletion and amortization expense [Abstract]
Total depreciation expense													14,956	13,898	15,457
Assets by segment [Abstract]
Total Assets	123,523				126,801				140,827				123,523	126,801	140,827
Reportable Segment [Member]
Segment Reporting Information, Results of operations [Abstract]
Operating income (loss) from identified segments													3,703	406	(1,428)
Reportable Segment [Member] | Oil and gas [Member]
Segment Reporting Information, Results of operations [Abstract]
Revenues													32,379	33,647	32,534
Total operating expenses													25,323	29,920	30,870
Total interest expenses													368	264	169
Operating income (loss) from identified segments													6,688	3,463	1,495
Add back Interest expenses													368	264	169
Depreciation depletion and amortization expense [Abstract]
Total depreciation expense													14,685	13,623	14,893
Assets by segment [Abstract]
Total Assets	92,020				97,418				93,839				92,020	97,418	93,839
Reportable Segment [Member] | Mineral properties [Member]
Segment Reporting Information, Results of operations [Abstract]
Total operating expenses													2,985	3,045	2,899
Total interest expenses													0	12	24
Operating income (loss) from identified segments													(2,985)	(3,057)	(2,923)
Add back Interest expenses													0	12	24
Depreciation depletion and amortization expense [Abstract]
Total depreciation expense													123	126	127
Assets by segment [Abstract]
Total Assets	21,942				20,739				20,747				21,942	20,739	20,747
Corporate [Member]
Depreciation depletion and amortization expense [Abstract]
Total depreciation expense													148	149	437
Assets by segment [Abstract]
Total Assets	$ 9,561				$ 8,644				$ 26,241				$ 9,561	$ 8,644	$ 26,241