Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Cash Flows from Operating Activities
Net income	$ 935	$ 1,352
Adjustments to reconcile net income to net cash used in operating activities
Depreciation	266	305
Amortization	180	161
Provision for doubtful accounts receivable	56	(3)
Stock-based compensation	185	243
Deferred income taxes	92	97
(Increase) decrease in:
Accounts receivable	1,629	(169)
Inventories	(1,152)	(1,577)
Prepaid expenses	(236)	(229)
(Decrease) increase in:
Accounts payable	(135)	31
Accrued expenses	(267)	(42)
Deferred revenue	(322)	(322)
Income taxes payable	300	50
Net cash provided by (used in) operating activities	1,530	(103)
Cash Flows from Investing Activities
Purchase of property and equipment	(302)	(106)
Acquisition of patents and other intangibles	(82)	(78)
Net cash used in investing activities	(384)	(184)
Foreign exchange rate effect on cash and cash equivalents	(79)	(69)
Net decrease in cash and cash equivalents	1,067	(356)
Cash and cash equivalents
Beginning	12,470	12,680
Ending	$ 13,537	$ 12,324