CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 67,786	$ 54,910
Short-term investments	17,755	23,354
Receivables (net of allowances of $223 at June 30, 2013 and $319 at March 31, 2013)	32,265	40,005
Inventories	27,530	26,786
Prepaid expenses and other current assets	2,444	3,319
Net deferred tax assets, current	4,734	4,589
Total current assets	152,514	152,963
Long-term investments	18,301	17,000
Investment in unconsolidated affiliate	2,643	2,613
Property and equipment, net	25,600	25,330
Intangible assets, net	2,747	3,122
Net deferred tax assets, non-current	652	643
Other assets	85	92
Total assets	202,542	201,763
Current liabilities:
Accounts payable	6,166	8,123
Accrued payroll and related expenses	6,137	6,261
Accrued taxes	338	440
Other accrued liabilities	2,660	2,838
Deferred revenue	1,256	1,362
Warranty reserve	950	995
Total current liabilities	17,507	20,019
Non-current liabilities:
Deferred rent	740	729
Deferred revenue	3,850	3,750
Warranty reserve	377	389
Notes payable, less current portion	657	682
Total non-current liabilities	5,624	5,550
Total liabilities	23,131	25,569
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; 22,283,000 and 22,120,000 shares issued and outstanding at June 30, 2013 and at March 31, 2013, respectively	121,020	121,019
Retained earnings	58,362	55,133
Accumulated other comprehensive income	29	42
Total shareholders' equity	179,411	176,194
Total liabilities and shareholders' equity	$ 202,542	$ 201,763