Note 11 - Revenue Recognition - Revenue Attributed to United States and All Other Countries (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Net sales	$ 13,639,169	$ 17,367,068	$ 41,389,993	$ 53,074,911
UNITED STATES
Net sales	11,086,545	14,421,221	33,432,451	43,460,603
Non-US [Member]
Net sales	$ 2,552,624	$ 2,945,847	$ 7,957,542	$ 9,614,308