CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 37,994	$ 43,471
Short-term investments	17,649	25,981
Receivables (net of allowances of $259 at September 30, 2011 and $320 at March 31, 2011)	27,490	27,880
Inventories	19,109	19,814
Prepaid expenses and other current assets	5,068	3,496
Net deferred tax assets, current	3,048	3,422
Total current assets	110,358	124,064
Long-term investments	29,099	36,237
Investment in unconsolidated affiliate	2,697	2,769
Property and equipment, net	22,913	19,637
Intangible assets, net	3,919	4,216
Net deferred tax assets, non-current	1,203	1,203
Other assets	111	134
Total assets	170,300	188,260
Current liabilities:
Accounts payable	6,996	6,173
Accrued payroll and related expenses	6,873	6,129
Accrued taxes	232	559
Other accrued liabilities	1,788	1,677
Deferred revenue	1,103	953
Warranty reserve	1,123	1,031
Total current liabilities	18,115	16,522
Non-current liabilities:
Deferred rent	530	416
Deferred revenue	2,105	1,737
Warranty reserve	313	191
Notes payable, less current portion	834	746
Total non-current liabilities	3,782	3,090
Total liabilities	21,897	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; 21,653,000 and 22,587,000 shares issued and outstanding at September 30, 2011 and at March 31, 2011, respectively	106,262	132,042
Retained earnings	42,141	36,606
Total shareholders' equity	148,403	168,648
Total liabilities and shareholders' equity	$ 170,300	$ 188,260