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2. Summary of Significant Accounting Policies (Details Narrative) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Credit line borrowing capacity	$ 9,853,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Credit line amount outstanding	5,319,000us-gaap_LineOfCredit
Foreign currency transaction gains/losses	47,000us-gaap_ForeignCurrencyTransactionGainLossRealized	24,000us-gaap_ForeignCurrencyTransactionGainLossRealized
Amortization expense for capitalized software development	912,000us-gaap_CapitalizedComputerSoftwareAmortization	864,000us-gaap_CapitalizedComputerSoftwareAmortization
Capitalized software costs not subject to amorization	495,000ntn_CapitalizedSoftwareCostsNotSubjectToAmorization	934,000ntn_CapitalizedSoftwareCostsNotSubjectToAmorization
Software impairment	668,000us-gaap_AssetImpairmentCharges	230,000us-gaap_AssetImpairmentCharges
Advertising costs	$ 3,000us-gaap_AdvertisingExpense	$ 9,000us-gaap_AdvertisingExpense

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Capitalized software costs not subject to amorization

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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