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Business activities and summary of significant accounting policies - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
May 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Business Activities And Summary Of Significant Accounting Policies [Line Items]      
Amortization of Intangible Assets   $ 275,000 $ 275,000
Advertising Expense   236,000 125,000
Research and Development Expense   1,480,000 824,000
Stock based compensation expense   $ 211,000 $ 214,000
Shares excluded from computation of diluted per share amount   133,220 737,512
Earn-out Payment $ 800,000    
Present Value of Future Insurance Profits, Weighted Average Amortization Period   9 years 5 months 23 days  
Income Tax Expense (Benefit)   $ 1,468,000 $ 62,000
Effective Income Tax Rate Reconciliation, Percent   2.60%  
Maximum      
Business Activities And Summary Of Significant Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life   5 years  
Minimum      
Business Activities And Summary Of Significant Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life   3 years  
Selling General and Engineering Expenses      
Business Activities And Summary Of Significant Accounting Policies [Line Items]      
Stock based compensation expense   $ 211,000 201,000
Cost of Sales      
Business Activities And Summary Of Significant Accounting Policies [Line Items]      
Stock based compensation expense   0 $ 13,000
Other Operating Income (Expense) [Member]      
Business Activities And Summary Of Significant Accounting Policies [Line Items]      
Income Tax Expense (Benefit)   $ (189,000)