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National Holdings Corporation Acquisition – Intangible Assets - Amortization is calculated using the straight-line method over the estimated useful lives (Detail)
6 Months Ended
Jun. 30, 2017
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