SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 48,466,000	$ 48,803,000
Less accumulated depreciation and amortization	24,256,000	22,604,000
Property and equipment, net	24,210,000	26,199,000	27,554,000
Depreciation expense	3,700,000	3,800,000	3,500,000
Cost of Sales [Member]
Property, Plant and Equipment, Net [Abstract]
Depreciation expense	2,600,000	2,600,000	2,800,000
General and Administrative Expense [Member]
Property, Plant and Equipment, Net [Abstract]
Depreciation expense	1,100,000	1,200,000	700,000
Land [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	6,026,000	6,026,000
Equipment and vehicles [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	26,227,000	26,979,000
Equipment and vehicles [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	1 year
Equipment and vehicles [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	10 years
Office equipment [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	2,021,000	2,481,000
Office equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	1 year
Office equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	7 years
Rental equipment [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	5,191,000	5,046,000
Operating lease term	5 years
Future Minimum Payments Receivable
2013	1,592,000
2014	1,316,000
2015	1,090,000
2016	698,000
2017	263,000
Total future operating lease revenue	4,959,000
Rental equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	3 years
Rental equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	5 years
Building and leasehold improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 9,001,000	$ 8,271,000
Building and leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	5 years
Building and leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	40 years