Note 11 - Intangible Assets - Intangible Assets (Details) (Parentheticals)	6 Months Ended	12 Months Ended
	Apr. 30, 2020	Oct. 31, 2019
Noncompete Agreements [Member]
Estimated life (Year)	5 years	5 years
Customer Relationships [Member] | Minimum [Member]
Estimated life (Year)	7 years	7 years
Customer Relationships [Member] | Maximum [Member]
Estimated life (Year)	15 years	15 years
Order or Production Backlog [Member] | Minimum [Member]
Estimated life (Year)	1 year	1 year
Order or Production Backlog [Member] | Maximum [Member]
Estimated life (Year)	2 years	2 years
Patents [Member] | Minimum [Member]
Estimated life (Year)	10 years	10 years
Patents [Member] | Maximum [Member]
Estimated life (Year)	14 years	14 years