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INCOME TAXES (Details 1) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities:    
Property and equipment $ (5,009,000) $ (7,595,000)
Total deferred tax liabilities (5,009,000) (7,595,000)
Deferred tax assets:    
Net operating loss carryforwards 1,421,000 2,783,000
Accruals and allowances 157,000 193,000
Tax credits 438,000 380,000
Other - net 186,000 200,000
Capital loss carryover 959,000 1,228,000
Total deferred tax assets 3,161,000 4,784,000
Valuation allowance (1,062,000) (1,365,000)
Deferred tax assets net of valuation allowance 2,099,000 3,419,000
Net deferred tax liabilities $ (2,910,000) $ (4,176,000)