SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND GENERAL (Property and Equipment) (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 41,543,000	$ 40,873,000
Less accumulated depreciation	31,757,000	29,661,000
Property and equipment, net	9,786,000	11,212,000
Depreciation expense	2,100,000	2,200,000
Cost of Sales [Member]
Property, Plant and Equipment, Net [Abstract]
Depreciation expense	2,000,000	2,100,000
General and Administrative Expense [Member]
Property, Plant and Equipment, Net [Abstract]
Depreciation expense	51,900	74,500
Land [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	4,993,000	4,993,000
Equipment and vehicles [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 27,408,000	26,738,000
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	$ 1,457,000	1,457,000
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
Building and leasehold improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 7,685,000	$ 7,685,000
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

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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