National Holdings Corporation - Amortization is calculated using the straight-line method over the estimated useful lives (Detail) |
12 Months Ended |
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Dec. 31, 2016 | |
| Trademarks [Member] | |
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |
| Customer Lists [Member] | |
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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