XML 81 R49.htm IDEA: XBRL DOCUMENT
v2.4.0.6

9. Basic and Diluted Earnings Per Common Share (Details Narrative) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Basic and Diluted Earnings Per Common Share |  |
Options, warrants, convertible preferred stock and deferred stock units, anti-dilutive | 7,030,000 | 9,024,000

X
- Details
Name: | ntn_BasicAndDilutedEarningsPerCommonShareAbstract
Namespace Prefix: | ntn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Options warrants convertible preferred stock and deferred stock units outstanding + References No definition available. + Details
Name: | ntn_OptionsWarrantsConvertiblePreferredStockAndDeferredStockUnitsOutstanding1
Namespace Prefix: | ntn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration