Note 15 - Stock-based Compensation - Summarize Stock Option Activity (Details)	11 Months Ended
	Oct. 31, 2019 $ / shares shares
Options outstanding, Number (in shares) | shares	2,783,479
Options outstanding, Weighted average exercise price (in dollars per share) | $ / shares	$ 1.48
Granted, Number (in shares) | shares	881,193
Granted, Weighted average exercise price (in dollars per share) | $ / shares	$ 0.01
Forfeited, Number (in shares) | shares	(22,250)
Forfeited, Weighted average exercise price (in dollars per share) | $ / shares	$ 0.01
Exercised, Number (in shares) | shares	(1,573,024)
Exercised, Weighted average exercise price (in dollars per share) | $ / shares	$ 0.87
Expired, Number (in shares) | shares
Expired, Weighted average exercise price (in dollars per share) | $ / shares
Options outstanding, Number (in shares) | shares	2,069,398
Options outstanding, Weighted average exercise price (in dollars per share) | $ / shares	$ 1.33