Annual report pursuant to Section 13 and 15(d)

National Holdings Corporation - Additional Information (Detail)

v3.8.0.1
National Holdings Corporation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
Apr. 27, 2016
Dec. 31, 2017
Dec. 01, 2017
Jun. 01, 2017
Mar. 17, 2017
Dec. 31, 2016
Sep. 09, 2016
Business Combination, Consideration Transferred     $ 22,872          
Common Stock Par Or Stated Value Per Share     $ 0.001 $ 3.26 $ 1.90   $ 0.001  
Goodwill     $ 18,645       $ 18,645  
National Holdings Corporation [Member]                
Business Acquisition, Percentage of Voting Interests Acquired 56.60% 56.00%       56.60%   56.60%
Business Acquisition, Share Price   $ 3.25           $ 3.25
Number Of Shares Tendered   7            
Business Combination, Consideration Transferred $ 22,900 $ 22,900            
Common Stock Par Or Stated Value Per Share   $ 0.02           $ 0.02