Note 11 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Oct. 31, 2020
Amortizable intangible assets, net	$ 2,929	$ 3,181
Non-amortizable intangible assets, trademarks	1,174	1,174
Noncompete Agreements [Member]
Amortizable intangible assets, gross	423	423
Accumulated amortization	(267)	(245)
Amortizable intangible assets, net	156	178
Customer Relationships [Member]
Amortizable intangible assets, gross	5,058	5,058
Accumulated amortization	(2,559)	(2,367)
Amortizable intangible assets, net	2,499	2,691
Order or Production Backlog [Member]
Amortizable intangible assets, gross	287	287
Accumulated amortization	(287)	(266)
Amortizable intangible assets, net	0	21
Patents [Member]
Amortizable intangible assets, gross	368	368
Accumulated amortization	(94)	(77)
Amortizable intangible assets, net	$ 274	$ 291