Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Jul. 31, 2013
Current Assets
Cash and cash equivalents	$ 12,753	$ 12,470
Accounts receivable, net of allowance for doubtful accounts of $533 and $495, respectively	15,377	14,425
Inventories	15,711	14,825
Income taxes refundable	537	254
Prepaid expenses	1,601	996
Deferred income taxes	1,987	1,827
Total current assets	47,966	44,797
Property and equipment, net	8,915	8,962
Intangible and other assets
Goodwill	12,303	12,155
Other intangible assets, net	11,341	11,715
Deferred income taxes	1,754	3,557
Patents, net	1,468	1,411
Cash value of life insurance	96	96
Total assets	83,843	82,693
Current Liabilities
Accounts payable	3,196	3,237
Accrued expenses	2,942	3,486
Deferred revenue	1,288	1,288
Total current liabilities	7,426	8,011
Long-Term Liabilities
Deferred revenue	13,564	14,530
Total long-term liabilities	13,564	14,530
Total liabilities	20,990	22,541
Commitments and contingencies (Note 9)
Stockholders' Equity
Common stock at April 30, 2014 and July 31, 2013, $0.001 par value, 50,000,000 shares authorized; 25,333,479 and 25,292,960 shares issued and outstanding, respectively	25	25
Additional paid-in capital	28,357	27,489
Retained earnings	34,749	33,097
Accumulated other comprehensive loss:
Foreign currency translation adjustment	(278)	(459)
Total stockholders' equity	62,853	60,152
Total liabilities and stockholders' equity	$ 83,843	$ 82,693