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Note 9 - Share-based Compensation - Other Information Related to Stock Options (Details) - $ / shares
6 Months Ended
May 31, 2018
May 31, 2017
Expected volatility 50.00% 50.00%
Expected term of options (Year) 3 years 3 years
Expected dividend rate 0.00% 0.00%
Risk-free interest rate 1.80% 1.20%
Expected forfeiture rate 2.30% 2.50%
Weighted-average grant-date fair value (in dollars per share) $ 1.35 $ 2.14