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13. Income taxes (Details) - Deferred Income Tax Components (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Foreign net operating losses $ 282,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign $ 242,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Capitalized research and development 104,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 68,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Accrued lawsuit settlement expenses 1,262,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 127,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Inventory reserves 1,063,000us-gaap_DeferredTaxAssetsInventory 1,050,000us-gaap_DeferredTaxAssetsInventory
Deferred revenue 56,000us-gaap_DeferredTaxAssetsGrossCurrent 59,000us-gaap_DeferredTaxAssetsGrossCurrent
Warranty reserve 1,262,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 127,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Stock compensation expense 1,049,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 956,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other accrued compensation 406,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation  
Foreign tax and other credits 106,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 45,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Other liabilities and reserves 312,000us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent 491,000us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
Gross deferred tax assets 4,636,000us-gaap_DeferredTaxAssetsGross 3,038,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (282,000)us-gaap_DeferredTaxAssetsValuationAllowance (242,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 4,354,000us-gaap_DeferredTaxAssetsNet 2,796,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Depreciation 142,000us-gaap_DeferredTaxLiabilitiesNoncurrent 175,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Other 76,000us-gaap_DeferredTaxAssetsOther 46,000us-gaap_DeferredTaxAssetsOther
Net deferred tax liabilities 218,000us-gaap_DeferredTaxLiabilities 221,000us-gaap_DeferredTaxLiabilities
Total net deferred tax assets $ 4,136,000us-gaap_DeferredTaxAssetsLiabilitiesNet $ 2,575,000us-gaap_DeferredTaxAssetsLiabilitiesNet