Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Cash Flows from Operating Activities
Net income	$ 1,652	$ 1,120
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	864	856
Amortization	553	504
Provision for doubtful accounts receivable	66	91
Stock-based compensation	807	713
Deferred income taxes	1,643	(215)
Gain on sale	(9)
(Increase) decrease in:
Accounts receivable	(861)	(420)
Inventories	(822)	672
Prepaid expenses	(581)	(302)
Income taxes refundable	(282)	(862)
(Decrease) increase in:
Accounts payable	(60)	312
Accrued expenses	(497)	(154)
Deferred revenue	(966)	(966)
Income taxes payable	(70)	(191)
Net cash provided by operating activities	1,437	1,158
Cash Flows from Investing Activities
Proceeds from sale	18	0
Purchase of property and equipment	(800)	(397)
Acquisition of patents and other intangibles	(229)	(298)
Net cash used in investing activities	(1,011)	(695)
Cash flows from financing activities
Proceeds from the issuance of common stock	36	65
Tax benefit associated with the exercise of non-qualified stock options	25	72
Net cash provided by financing activities	61	137
Foreign exchange rate effect on cash and cash equivalents	(204)	(181)
Net increase in cash and cash equivalents	283	419
Cash and cash equivalents
Beginning	12,470	12,680
Ending	$ 12,753	$ 13,099