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Intangible assets (Tables)
 6 Months Ended
Apr. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets
Intangible assets consist of the following (in thousands): 
 
 
 
April 30, 2018
 
October 31, 2017
 
Amortizable intangible assets:
 
 
 
 
 
 
 
Customer relationships (estimated lives 7 - 15 years)
 
$
5,099
 
$
5,099
 
Accumulated amortization
 
 
(2,458)
 
 
(2,186)
 
 
 
 
2,641
 
 
2,913
 
 
 
 
 
 
 
 
 
Patents (estimated life 14 years)
 
 
142
 
 
142
 
Accumulated amortization
 
 
(30)
 
 
(25)
 
 
 
 
112
 
 
117
 
 
 
 
 
 
 
 
 
Totals
 
$
2,753
 
$
3,030
 
 
 
 
 
 
 
 
 
Non-amortizable intangible assets:
 
 
 
 
 
 
 
Trademarks
 
$
1,237
 
$
1,237