Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 45,073	$ 43,471
Short-term investments	16,691	25,981
Receivables (net of allowances of $287 at June 30, 2011 and $320 at March 31, 2011)	26,422	27,880
Inventories	18,608	19,814
Prepaid expenses and other current assets	3,854	3,496
Net deferred tax assets, current	3,430	3,422
Total current assets	114,078	124,064
Long-term investments	47,129	36,237
Investment in unconsolidated affiliate	2,731	2,769
Property and equipment, net	21,532	19,637
Intangible assets, net	4,067	4,216
Net deferred tax assets, non-current	1,203	1,203
Other assets	132	134
Total assets	190,872	188,260
Current liabilities:
Accounts payable	5,777	6,173
Accrued payroll and related expenses	6,215	6,129
Accrued taxes	533	559
Other accrued liabilities	1,805	1,677
Deferred revenue	1,044	953
Warranty reserve	1,195	1,031
Total current liabilities	16,569	16,522
Non-current liabilities:
Deferred rent	478	416
Deferred revenue	1,958	1,737
Warranty reserve	275	191
Notes payable, less current portion	725	746
Total non-current liabilities	3,436	3,090
Total liabilities	20,005	19,612
Commitments and contingencies (Note 9)
Shareholders' equity:
Preferred stock, no par value: 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, no par value: 35,000,000 shares authorized; 22,751,000 and 22,587,000 shares issued and outstanding at June 30, 2011 and at March 31, 2011, respectively	132,047	132,042
Retained earnings	38,820	36,606
Total shareholders' equity	170,867	168,648
Total liabilities and shareholders' equity	$ 190,872	$ 188,260