Employee benefit plan (Tables)

12 Months Ended

Jul. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Substantially Funded [Table Text Block]

The status of the Swiss Plan, which is substantially funded as of December 31, 2018, the latest plan year end, is as follows:

As of December 31,	2018			2017			2016
Total Assets	$	2,064		$	1,849		$	2,184
Accumulated Benefit Obligation	$	2,308		$	2,094		$	2,432
Funded status		90	%		88	%		90	%

Schedule of Contributions Plan [Table Text Block]

Fiscal Year ended July 31,		2018		2017		2016
Contributions	$	208	$	205	$	224