CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 54,109	$ 45,843
Short-term investments	24,764	21,689
Receivables (net of allowances of $202 at September 30, 2012 and $283 at March 31, 2012)	48,395	30,694
Inventories	22,060	19,597
Prepaid expenses and other current assets	2,099	5,423
Net deferred tax assets, current	4,328	4,151
Total current assets	155,755	127,397
Long-term investments	21,718	23,442
Investment in unconsolidated affiliate	2,592	2,626
Property and equipment, net	25,315	24,296
Intangible assets, net	3,673	3,990
Other assets	77	85
Total assets	209,130	181,836
Current liabilities:
Accounts payable	8,202	6,381
Accrued payroll and related expenses	8,065	6,336
Accrued taxes	3,531	266
Other accrued liabilities	3,109	1,991
Deferred revenue	1,280	1,212
Warranty reserve	1,043	1,245
Total current liabilities	25,230	17,431
Non-current liabilities:
Deferred rent	691	641
Net deferred tax liabilities	89	199
Deferred revenue	2,913	2,396
Warranty reserve	437	601
Notes payable, less current portion	733	783
Total non-current liabilities	4,863	4,620
Total liabilities	30,093	22,051
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; 21,940,000 and 21,699,000 shares issued and outstanding at September 30, 2012 and at March 31, 2012, respectively	113,520	110,063
Retained earnings	65,470	49,697
Accumulated other comprehensive income	47	25
Total shareholders' equity	179,037	159,785
Total liabilities and shareholders' equity	$ 209,130	$ 181,836