Equity (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Equity [Abstract]
Balance, July 31, 2018				$ 10,010
Exercise of stock options				2
Stock-based compensation	[1]			449
Purchase of treasury stock		$ 31		31
Comprehensive loss:
Net loss		(1,195)	$ (309)	(2,142)	$ (1,302)
Foreign currency translation adjustments		(93)	$ (152)	(224)	$ (50)
Total comprehensive loss				(2,366)
Balance, April 30, 2019		$ 8,064		$ 8,064

[1] This amount includes stock issued to pay for the Board of Directors' compensation of $45,000 and the Company's matching contribution to employees' 401(k) plan with a value of $48,000.