Note 13 - Capital Stock - Schedule of Outstanding Unvested Stock Options (Details) - $ / shares	3 Months Ended
	Jan. 31, 2021	Oct. 31, 2020
Nonvested balance (in shares)	6,078,716	6,797,471
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 0.46	$ 0.46
Vested (in shares)	(1,042,559)	(718,755)
Vested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 0.48	$ 0.46
Nonvested balance (in shares)	5,036,157	6,078,716
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 0.45	$ 0.46