Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Cash Flows from Operating Activities
Net income	$ 2,638	$ 1,953
Plus: Loss from discontinued operations - net of tax	382	(7)
Income from continuing operations	3,020	1,946
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	570	509
Amortization	324	343
Provision for doubtful accounts receivable	0	(16)
Stock-based compensation	275	161
Deferred income taxes	221	2
Loss on sale of product line	0	99
Gain on sale of equipment	0	50
Changes in assets (increase) decrease in:
Accounts receivable	617	64
Inventories	(1,361)	(1,907)
Prepaid expenses	(258)	(158)
Income taxes refundable	(31)	(422)
Changes in liabilities (Decrease) increase in:
Accounts payable	804	155
Accrued expenses	(428)	(406)
Deferred revenue	(851)	305
Income taxes payable	(6,039)	(11)
Net cash (used in) provided by continuing operating activities	(3,137)	714
Net cash (used in) provided by discontinued operations	34	(32)
Net (used in) provided by operating activities	(3,103)	682
Cash Flows from Investing Activities
Proceeds from sale of equipment	0	11
Purchase of property and equipment	(983)	(949)
Acquisition of patents and other intangibles	(162)	(140)
Net cash used in continuing investing activities	(1,145)	(1,078)
Net cash used in discontinued operations	0	(236)
Net cash used in investing activities	(1,145)	(1,314)
Cash Flows from Financing Activities
Principal payments on revenue bonds payable	0	(58)
Payment on debt incurred for acquisition of trademark	(313)	(295)
Tax benefit associated with the exercise of non- qualified stock options	8	97
Proceeds from the issuance of common stock	5	152
Net cash used in financing activities	(300)	(104)
Foreign exchange rate effect on cash and cash equivalents	79	(14)
Net decrease in cash and cash equivalents	(4,469)	(750)
Cash and cash equivalents
Beginning	18,399	18,669
Ending	$ 13,930	$ 17,919