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10. Income Taxes (Details-Deferred Tax Assets) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Current
Deferred Tax Assets:
NOL carryforwards	$ 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	$ 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
UK NOL carryforwards	0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Capital loss	0us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Compensation and vacation accrual	135,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	150,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Operating accruals	38,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	37,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Deferred revenue	517,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	224,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Research and experimentation, AMT and foreign tax credits	0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
State Margin Tax Credit	0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Fixed assets and intangibles	0us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Foreign	3,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	3,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Other	139,000us-gaap_DeferredTaxAssetsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	130,000us-gaap_DeferredTaxAssetsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Total gross deferred tax assets	832,000us-gaap_DeferredTaxAssetsGross / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	544,000us-gaap_DeferredTaxAssetsGross / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Valuation allowance	(806,000)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	(515,000)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Net deferred tax assets	26,000us-gaap_DeferredTaxAssetsNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	29,000us-gaap_DeferredTaxAssetsNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Deferred Tax Liabilities:
Capitalized software	0us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Amortization	0us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Foreign	0ntn_DeferredTaxLiabilitiesDeferredExpenseForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0ntn_DeferredTaxLiabilitiesDeferredExpenseForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Deferred revenue	0ntn_DeferredTaxLiabilitiesDeferredExpenseDeferredRevenue / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	0ntn_DeferredTaxLiabilitiesDeferredExpenseDeferredRevenue / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Other	21,000us-gaap_DeferredTaxLiabilitiesOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	40,000us-gaap_DeferredTaxLiabilitiesOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Total gross deferred liabilities	21,000us-gaap_DeferredIncomeTaxLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	40,000us-gaap_DeferredIncomeTaxLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Net deferred taxes	5,000us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember	(11,000)us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_CurrentMember
Noncurrent
Deferred Tax Assets:
NOL carryforwards	21,058,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	19,406,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
UK NOL carryforwards	728,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	772,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Capital loss	416,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	409,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Compensation and vacation accrual	0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Operating accruals	257,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	302,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Deferred revenue	0us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	0us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Research and experimentation, AMT and foreign tax credits	156,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	156,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
State Margin Tax Credit	133,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	137,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Fixed assets and intangibles	447,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	630,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Foreign	0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Other	240,000us-gaap_DeferredTaxAssetsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	157,000us-gaap_DeferredTaxAssetsOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Total gross deferred tax assets	23,274,000us-gaap_DeferredTaxAssetsGross / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	21,969,000us-gaap_DeferredTaxAssetsGross / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Valuation allowance	(22,762,000)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	(21,042,000)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Net deferred tax assets	673,000us-gaap_DeferredTaxAssetsNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	927,000us-gaap_DeferredTaxAssetsNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Deferred Tax Liabilities:
Capitalized software	607,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	843,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Amortization	12,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	0us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Foreign	52,000ntn_DeferredTaxLiabilitiesDeferredExpenseForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	57,000ntn_DeferredTaxLiabilitiesDeferredExpenseForeign / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Deferred revenue	0ntn_DeferredTaxLiabilitiesDeferredExpenseDeferredRevenue / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	0ntn_DeferredTaxLiabilitiesDeferredExpenseDeferredRevenue / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Other	8,000us-gaap_DeferredTaxLiabilitiesOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	0us-gaap_DeferredTaxLiabilitiesOther / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Total gross deferred liabilities	679,000us-gaap_DeferredIncomeTaxLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	900,000us-gaap_DeferredIncomeTaxLiabilities / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember
Net deferred taxes	$ (6,000)us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember	$ 27,000us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ntn_NoncurrentMember

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