Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Jan. 31, 2013	Jul. 31, 2012
Current Assets
Cash and cash equivalents	$ 11,684,000	$ 12,680,000
Accounts receivable, net of allowance for doubtful accounts of $358 and $319, respectively	11,203,000	11,796,000
Inventories	15,180,000	15,679,000
Income taxes refundable	1,161,000	0
Prepaid expenses	1,157,000	825,000
Deferred income taxes	1,909,000	1,247,000
Total current assets	42,294,000	42,227,000
Property and equipment, net	8,998,000	9,239,000
Intangible and other assets
Goodwill	10,660,000	10,660,000
Other intangible assets, net	11,020,000	11,277,000
Deferred income taxes	3,852,000	4,088,000
Patents, net	1,234,000	1,179,000
Cash value of life insurance	93,000	93,000
Total assets	78,151,000	78,763,000
Current Liabilities
Accounts payable	1,901,000	2,144,000
Accrued expenses	2,471,000	2,844,000
Income taxes payable	0	191,000
Deferred revenue	1,288,000	1,288,000
Total current liabilities	5,660,000	6,467,000
Long-Term Liabilities
Deferred revenue	15,174,000	15,818,000
Total long-term liabilities	15,174,000	15,818,000
Total liabilities	20,834,000	22,285,000
Commitments and contingencies (Note 8)
Stockholders' Equity
Common stock at January 31, 2013 and July 31, 2012, $0.001 par value, 50,000,000 shares authorized; 25,298,681 and 25,160,069 shares issued and outstanding, respectively	25,000	25,000
Additional paid-in capital	27,037,000	26,421,000
Retained earnings	30,507,000	30,538,000
Accumulated other comprehensive (loss):
Foreign currency translation adjustment	(252,000)	(506,000)
Total stockholders' equity	57,317,000	56,478,000
Total liabilities and stockholders' equity	$ 78,151,000	$ 78,763,000