Note 12 - Stock-based Compensation - Schedule of Outstanding Unvested Stock Options (Details) - $ / shares	3 Months Ended
	Apr. 30, 2024	Jan. 31, 2024	Oct. 31, 2023
Balance, Non-vested, number of shares (in shares)	1,255,890	1,675,403	1,803,265
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.28	$ 2.29	$ 2.28
Granted, Non-vested, number of shares (in shares)	40,143	10,000	17,500
Granted, Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 4.45	$ 5.05	$ 3.36
Cancelled/Forfeited, Non-vested, number of shares (in shares)	(8,600)		(12,300)
Cancelled/Forfeited, Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.27		$ 2.37
Vested, Non-vested, number of shares (in shares)	(29,687)	(429,513)	(133,062)
Vested, Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.29	$ 2.39	$ 2.18
Granted, Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	4.45	5.05	3.36
Vested, Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	2.29	$ 2.39	2.18
Cancelled/Forfeited, Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.27		$ 2.37
Balance, Non-vested, number of shares (in shares)	1,257,746	1,255,890	1,675,403
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.35	$ 2.28	$ 2.29