Employee benefit plan (Tables)

12 Months Ended

Jul. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Substantially Funded [Table Text Block]

The status of the Swiss Plan, which is substantially funded as of December 31, 2016, the latest plan year end, is as follows:

As of December 31,	2016			2015			2014
Total Assets	$	2,184		$	2,149		$	2,132
Accumulated Benefit Obligation	$	2,432		$	2,397		$	2,421
Funded status		90	%		90	%		88	%

Schedule of Contributions Plan [Table Text Block]

Fiscal Year ended July 31,	2016		2015		2014
Contributions	$	224	$	224	$	279