Note 11 - Revenue Recognition - Revenue Attributed to United States and All Other Countries (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Net sales	$ 15,741,114	$ 14,863,428	$ 27,617,687	$ 27,750,824
UNITED STATES
Net sales	12,381,735	11,857,559	22,085,345	22,345,906
Non-US [Member]
Net sales	$ 3,359,379	$ 3,005,869	$ 5,532,342	$ 5,404,918