Annual report pursuant to Section 13 and 15(d)

Share Repurchase Plan - Additional Information (Detail)

v3.8.0.1
Share Repurchase Plan - Additional Information (Detail) - USD ($)
 12 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Jun. 20, 2016
Nov. 30, 2017
Oct. 06, 2016
Apr. 08, 2015
Jun. 06, 2012
Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]                
Number of shares authorized to repurchase         8,000,000 6,000,000 3,000,000 1,000,000
Share repurchase plan       Open market purchases, privately negotiated block trades, unsolicited negotiated transactions, and/or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission        
Repurchase agreement, aggregate amount     $ 9,866,178          
Repurchase agreement, aggregate amount     $ 8,000,000          
Treasury stock, shares 5,801,086 5,714,868   5,801,086        
Ki Yong Choi [Member]                
Equity, Class of Treasury Stock [Line Items]                
Repurchase agreement, number of shares to be repurchased     2,179,068          
Repurchase agreement, purchase price per share     $ 4.50          
Michael Cho [Member]                
Equity, Class of Treasury Stock [Line Items]                
Repurchase agreement, number of shares to be repurchased     13,416          
Repurchase agreement, purchase price per share     $ 4.50          
Common Stock [Member]                
Equity, Class of Treasury Stock [Line Items]                
Repurchase agreement, purchase price per share $ 3.37 $ 3.35            
Treasury stock, shares 5,801,086 5,714,171   5,801,086