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11. Commitments (Details-Notes Payable minimum payments) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]    
2015 $ 2,525,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 2,253,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 1,103,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 4,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Thereafter 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Total minimum payments 5,885,000ntn_LongTermDebtMinimumPayments  
Less amounts representing interest (566,000)ntn_LongTermDebtMinimumPaymentsAmountsRepresentingInterest  
Total notes payable 5,319,000us-gaap_LongTermDebt  
Less current portion (2,176,000)us-gaap_LongTermDebtCurrent (631,000)us-gaap_LongTermDebtCurrent
Long-term portion $ 3,143,000us-gaap_LongTermNotesPayable $ 962,000us-gaap_LongTermNotesPayable