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Income tax provision - Provision (benefit) for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Current:    
Federal $ 859 $ 1,344
State 220 236
Current income tax expense (benefit) 1,079 1,580
Deferred:    
Federal (25) (112)
State (18) 0
Deferred Federal, State and Local, Tax Expense (Benefit), Total (43) (112)
Income Tax Expense (Benefit), Total $ 1,036 $ 1,468