CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 45,843	$ 43,471
Short-term investments	21,689	25,981
Receivables (net of allowances of $283 in 2012 and $320 in 2011)	30,694	27,880
Inventories	19,597	19,814
Prepaid expenses and other current assets	5,423	3,496
Net deferred tax assets, current	4,151	3,422
Total current assets	127,397	124,064
Long-term investments	23,442	36,237
Investment in unconsolidated affiliate	2,626	2,769
Property and equipment, net	24,296	19,637
Intangible assets, net	3,990	4,216
Net deferred tax assets, non-current	0	1,203
Other assets	85	134
Total assets	181,836	188,260
Current liabilities:
Accounts payable	6,381	6,173
Accrued payroll and related expenses	6,336	6,129
Accrued taxes	266	559
Other accrued liabilities	1,991	1,677
Deferred revenue	1,212	953
Warranty reserve	1,245	1,031
Total current liabilities	17,431	16,522
Non-current liabilities:
Deferred rent	641	416
Net deferred tax liabilities	199	0
Deferred revenue	2,396	1,737
Warranty reserve	601	191
Notes payable, less current portion	783	746
Total non-current liabilities	4,620	3,090
Total liabilities	22,051	19,612
Commitments and contingencies (Note 10)
Shareholders' equity:
Preferred stock, no par value: 5,000,000 shares authorized; no shares issued and outstanding in 2012 and 2011	0	0
Common stock, no par value: 35,000,000 shares authorized; 21,699,000 and 22,587,000 shares issued and outstanding in 2012 and 2011, respectively	110,063	132,042
Retained earnings	49,697	36,606
Accumulated other comprehensive income	25	0
Total shareholders' equity	159,785	168,648
Total liabilities and shareholders' equity	$ 181,836	$ 188,260