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Intangible assets
 9 Months Ended
Jul. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets
Note 11 - Intangible assets
 
Intangible assets consist of the following (in thousands): 
 
 
 
July 31, 2018
 
 
October 31, 2017
 
Amortizable intangible assets:
 
 
 
 
 
 
 
 
Customer relationships (estimated lives 7 - 15 years)
 
$
5,099
 
 
$
5,099
 
Accumulated amortization
 
 
(2,594
)
 
 
(2,186
)
 
 
 
2,505
 
 
 
2,913
 
 
 
 
 
 
 
 
 
 
Patents (estimated life 14 years)
 
 
142
 
 
 
142
 
Accumulated amortization
 
 
(32
)
 
 
(25
)
 
 
 
110
 
 
 
117
 
 
 
 
 
 
 
 
 
 
Totals
 
$
2,615
 
 
$
3,030
 
 
 
 
 
 
 
 
 
 
Non-amortizable intangible assets:
 
 
 
 
 
 
 
 
Trademarks
 
$
1,237
 
 
$
1,237
 
 
Amortization expense for the nine-months ended July 31, 2018 and the year ended October 31, 2017 was $415,000 and $589,000, respectively. The weighted-average amortization period for the amortizable intangible assets is 9.48 years.