Note 9 - Net Income (Loss) Per Share - Components of Reconciliation of Numerators and Denominators Net Loss Per Share (Details) - USD ($)	3 Months Ended				6 Months Ended
	Apr. 30, 2023	Jan. 31, 2023	Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2023	Apr. 30, 2022
Net income (loss)	$ 2,423,087	$ 809,984	$ (227,991)	$ (935,793)	$ 3,233,071	$ (1,163,784)
Shares (denominator) (in shares)	7,867,755		7,487,337		7,880,685	7,464,862
Net income (loss) per share: Basic and diluted (in dollars per share)	$ 0.31		$ (0.03)		$ 0.41	$ (0.16)