Annual report pursuant to Section 13 and 15(d)

Stock-based compensation - Shares Granted by Exercise Price Range (Details)

v3.3.1.900
Stock-based compensation - Shares Granted by Exercise Price Range (Details)
 12 Months Ended
Nov. 30, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Granted (shares) 104,000
Number of Option Shares Vested (shares) 49,000
$3.40  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price (usd per share) | $ / shares $ 3.40
Number of Options Granted (shares) 20,000
Weighted-Average Remaining Term (years) 3 years 2 months 1 day
Number of Option Shares Vested (shares) 20,000
$3.42  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price (usd per share) | $ / shares $ 3.42
Number of Options Granted (shares) 27,000
Weighted-Average Remaining Term (years) 8 years 10 months 2 days
Number of Option Shares Vested (shares) 27,000
$3.36  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price (usd per share) | $ / shares $ 3.36
Number of Options Granted (shares) 2,000
Weighted-Average Remaining Term (years) 8 years 10 months 17 days
Number of Option Shares Vested (shares) 2,000
$3.48  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price (usd per share) | $ / shares $ 3.48
Number of Options Granted (shares) 45,000
Weighted-Average Remaining Term (years) 9 years 1 month 6 days
Number of Option Shares Vested (shares) 0
$3.18  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price (usd per share) | $ / shares $ 3.18
Number of Options Granted (shares) 10,000
Weighted-Average Remaining Term (years) 9 years 4 months 10 days
Number of Option Shares Vested (shares) 0