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Taxes (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Taxes [Line Items]    
Income taxes (benefit) at U.S. statutory rate $ 90,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (62,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 14,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 18,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Higher / (lower) effective taxes on earnings/losses in certain foreign countries 11,000relv_IncomeTaxReconciliationForeignIncomeTaxRateDifferential1 6,000relv_IncomeTaxReconciliationForeignIncomeTaxRateDifferential1
Foreign corporate income taxes 27,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (5,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Other, net 6,000us-gaap_IncomeTaxReconciliationOtherAdjustments 11,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Expense (Benefit), Total $ 148,000us-gaap_IncomeTaxExpenseBenefit $ (32,000)us-gaap_IncomeTaxExpenseBenefit