Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current Assets:
Cash and cash equivalents	$ 20,537	$ 15,540
Available-for-sale securities	15,147	14,117
Accounts receivable, net of allowance for doubtful accounts of $20 and $40 as of March 31, 2013 and September 30, 2012, respectively	4,911	5,069
Inventories	3,364	3,524
Deferred tax assets	197	219
Prepaids and other	1,495	603
Current assets of discontinued operations	129	883
Total Current Assets	45,780	39,955
Property and equipment, net	13,214	13,610
Available-for-sale securities	27,506	28,433
Deferred tax assets	5,878	5,806
Intangible assets, net	4,060	4,430
Goodwill	8,010	8,010
Other assets, net	3,145	4,075
Total Assets	107,593	104,319
Current Liabilities:
Accounts payable	969	1,657
Accrued liabilities:
Compensation	1,191	2,319
Accrued other	880	1,066
Deferred revenue	45	47
Other current liabilities	112	170
Current liabilities of discontinued operations	271	1,640
Total Current Liabilities	3,468	6,899
Deferred revenue, less current portion	181	185
Other long-term liabilities	1,959	2,247
Total Liabilities	5,608	9,331
Commitments and Contingencies (Note 15)
Stockholders' Equity:
Series A Preferred stock- $.05 par value, 450,000 shares authorized; no shares issued and outstanding
Common stock- $.05 par value, 45,000,000 shares authorized; 14,569,221 and 14,656,806 shares issued and outstanding, respectively	728	733
Additional paid-in capital	16,911	18,346
Accumulated other comprehensive income	127	40
Retained earnings	84,219	75,869
Total Stockholders' Equity	101,985	94,988
Total Liabilities and Stockholders' Equity	$ 107,593	$ 104,319