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10. Income Taxes (Details Narrative) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net change in valuation allowance	$ 1,733,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	$ (303,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
NOL carryforwards	59,663,000us-gaap_OperatingLossCarryforwards
NOL carryforward expiration date	Dec. 31, 2017
State NOL carryforward	25,461,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
State tax credit carryforward	$ 201,000ntn_StateTaxCreditCarryforward

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State tax credit carryforward

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

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-Name Accounting Standards Codification

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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