Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Tables)

v3.10.0.1
Goodwill and intangible assets (Tables)
 3 Months Ended
Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Indefinite-Lived Intangible Assets [Table Text Block] The Company’s change in the carrying amount of intangible assets, all in the Products segment is as follows:

    Gross   Accumulated Amortization   Net  
July 31, 2018   $ 27,347     $ (25,461 )   $ 1,886  
Amortization expense     —       (247 )     (247 )
Foreign currency translation     (137 )     123       (14 )
October 31, 2018   $ 27,210     $ (25,585 )   $ 1,625  
Schedule of Intangible Assets [Table Text Block] Intangible assets, all finite lived, consist of the following:

    October 31, 2018     July 31, 2018  
    Gross     Accumulated
Amortization		     Net     Gross     Accumulated
Amortization		     Net  
Patents   $ 11,027     $ (10,983 )   $ 44     $ 11,027     $ (10,980 )   $ 47  
Customer relationships     11,699       (10,118 )     1,581       11,836       (9,997 )     1,839  
Total   $ 27,210     $ (25,585 )   $ 1,625     $ 27,347     $ (25,461 )   $ 1,886  
Schedule of Useful Lives For Acquisitions [Table Text Block] At October 31, 2018, information with respect to intangibles assets acquired is as follows:

    Useful life assigned   Weighted average
remaining useful life 		 
Customer relationships   8 -15 years   2 years  
Other intangibles   10 years   4 years