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Income tax provision - Income tax at the federal statutory rate is reconciled (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Dec. 31, 2017
Income tax provision
Income taxes at federal statutory rate	$ 957	$ 1,737
State tax provision, net of federal tax benefit	160	170
Nondeductible differences:
Rel-Tech earn-out	0	(6)
Qualified domestic production activities deduction	0	(141)
Stock options	21	(204)
Meals and entertainment	8	8
R& D credits	(119)	(111)
ASC 740-10 Liability	21	54
Tax Cut and Jobs Act	0	(34)
Other	(12)	(5)
Net provision (benefit) for income taxes	$ 1,036	$ 1,468
Income taxes at federal statutory rate (% of Pretax Income)	21.00%	38.10%	35.00%
State tax provision, net of federal tax benefit (% of Pretax Income)	3.50%	3.70%
Nondeductible differences: (% of Pretax Income)
Rel-Tech earn-out (% of Pretax Income)	0.00%	(0.10%)
Qualified domestic production activities deduction (% of Pretax Income)	(0.00%)	(3.10%)
Stock compensation (% of Pretax Income)	0.50%	(4.50%)
Meals and entertainment (% of Pretax Income)	0.20%	0.20%
R& D credits (% of Pretax Income)	(2.60%)	(2.40%)
ASC 740-10 Liability (% of Pretax Income)	0.50%	1.20%
Tax Cut and Jobs Act (% of Pretax Income)	(0.00%)	(0.70%)
Other (% of Pretax Income)	(0.30%)	(0.10%)
Net provision (benefit) for income taxes (% of Pretax Income)	22.80%	32.30%

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