Note 18 - Segment Reporting - Operating Information (Details) - USD ($)	1 Months Ended	11 Months Ended		12 Months Ended
	Dec. 05, 2018	Oct. 31, 2019	Oct. 31, 2019	Oct. 31, 2018
Revenue	$ 24,396,000	$ 258,565,000		$ 243,223,000
(Loss) income before income taxes	(26,767,000)	(13,215,000)		18,597,000
EBITDA	(22,410,000)	74,317,000		65,645,000
Net income (loss)	(22,575,000)	(9,912,000)	$ (9,912,000)	28,382,000
Interest expense, net	1,644,000	34,880,000		21,425,000
Income tax expense (benefit)	(4,192,000)	(3,303,000)		(9,784,000)
Depreciation and amortization	2,713,000	52,652,000		25,623,000
Interest expense, net	(1,644,000)	(34,880,000)		(21,425,000)
Transaction costs	30,562,000	1,521,000		7,590,000
Corporate, Non-Segment [Member]
Revenue	242,000	2,258,000
(Loss) income before income taxes	155,000	1,848,000		2,114,000
EBITDA	180,000	2,577,000		2,366,000
Interest expense, net				4,000
Depreciation and amortization	25,000	729,000		248,000
Interest expense, net				(4,000)
Transaction costs	30,562,000
Intersegment Eliminations [Member]
Revenue	(276,000)	(2,524,000)
US Concrete Pumping [Member] | Operating Segments [Member]
Revenue	16,659,000	187,031,000		164,306,000
(Loss) income before income taxes	(27,354,000)	(17,689,000)		2,482,000
EBITDA	(24,565,000)	46,729,000		34,966,000
Interest expense, net	1,154,000	32,173,000		17,247,000
Depreciation and amortization	1,635,000	32,245,000		15,237,000
Interest expense, net	(1,154,000)	(32,173,000)		(17,247,000)
Transaction costs		1,521,000		7,590,000
UK Concrete Pumping [Member]
(Loss) income before income taxes	207,000	1,661,000		3,521,000
UK Concrete Pumping [Member] | Operating Segments [Member]
Revenue	5,143,000	44,021,000		50,448,000
EBITDA	1,587,000	13,173,000		15,754,000
Interest expense, net	490,000	2,705,000		4,173,000
Depreciation and amortization	890,000	8,807,000		8,060,000
Interest expense, net	(490,000)	(2,705,000)		(4,173,000)
US Concrete Waste Management Services [Member]
(Loss) income before income taxes	225,000	965,000		10,480,000
US Concrete Waste Management Services [Member] | Operating Segments [Member]
Revenue	2,628,000	27,779,000		28,469,000
EBITDA	388,000	11,838,000		12,559,000
Interest expense, net		2,000		1,000
Depreciation and amortization	163,000	10,871,000		2,078,000
Interest expense, net		$ (2,000)		$ (1,000)