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INCOME TAXES (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Property and equipment $ (7,145,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ (7,201,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (7,145,000)us-gaap_DeferredIncomeTaxLiabilities (7,201,000)us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Net operating loss carryforwards 3,424,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 3,607,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accruals and allowances 173,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances 240,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances
Tax credits 319,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 318,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other - net 235,000us-gaap_DeferredTaxAssetsOther 101,000us-gaap_DeferredTaxAssetsOther
Capital loss carryover 437,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 0us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Total deferred tax assets 4,588,000us-gaap_DeferredTaxAssetsGross 4,266,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (549,000)us-gaap_DeferredTaxAssetsValuationAllowance (95,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets net of valuation allowance 4,039,000us-gaap_DeferredTaxAssetsNet 4,171,000us-gaap_DeferredTaxAssetsNet
Net deferred tax liabilities $ (3,106,000)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (3,030,000)us-gaap_DeferredTaxAssetsLiabilitiesNet