Note 9 - Segment Information - Sales by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Net sales	$ 10,002	$ 12,414
UNITED STATES
Net sales	9,379	12,173
CANADA
Net sales	525	116
MEXICO
Net sales		5
All Other Foreign Countries [Member]
Net sales	98	120
Non-US [Member]
Net sales	$ 623	$ 241