Years ended November 30, | ||||||||||||||||||||||||
2013 | 2012 | 2011 | ||||||||||||||||||||||
Number of warrants (thousands) | Weighted average exercise price | Number of warrants (thousands) | Weighted average exercise price | Number of warrants (thousands) | Weighted average exercise price | |||||||||||||||||||
Balance beginning of year | 36,529 | $ | 1.48 | 40,420 | $ | 1.49 | 49,345 | $ | 1.65 | |||||||||||||||
Exercised | (36,529 | ) | $ | 1.48 | (3,891 | ) | $ | 1.48 | (8,925 | ) | $ | 1.48 | ||||||||||||
Balance end of year | | | 36,529 | $ | 1.48 | 40,420 | $ | 1.49 |