CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 107,015	$ 73,589
Short-term investments	26,109	29,102
Receivables (net of allowances of $247 in 2015 and $182 in 2014)	29,015	27,253
Inventories	36,179	26,583
Prepaid expenses and other current assets	2,893	2,347
Net deferred tax assets, current	6,575	4,464
Current assets of discontinued operations	2,075	2,474
Total current assets	209,861	165,812
Long-term investments	24,181	18,491
Investment in unconsolidated affiliate	2,683	2,646
Property and equipment, net	27,316	24,191
Intangible assets, net	1,491	1,200
Net deferred tax assets, non-current	3,413	1,557
Non-current assets of discontinued operations	12	3,431
Other assets	107	52
Total assets	269,064	217,380
Current liabilities:
Accounts payable	7,277	5,525
Accrued payroll and related expenses	11,094	4,372
Accrued taxes	4,829	1,144
Current liabilities of discontinued operations	5,536	879
Other accrued liabilities	9,804	3,084
Deferred revenue	1,322	1,208
Warranty reserve	1,423	1,047
Total current liabilities	41,285	17,259
Non-current liabilities:
Deferred revenue	3,219	4,035
Warranty reserve	1,733	821
Net deferred tax liabilities	310	0
Non-current liabilities of discontinued operations	0	16
Notes payable, less current portion	480	581
Other non-current liabilities	1,843	752
Total non-current liabilities	7,585	6,205
Total liabilities	48,870	23,464
Commitments and contingencies (Note 13)
Shareholders' equity:
Preferred stock, no par value: 5,000,000 shares authorized; no shares issued and outstanding in 2015 and 2014	0	0
Common stock, no par value: 35,000,000 shares authorized; 22,539,000 and 22,308,000 shares issued and outstanding in 2015 and 2014, respectively	132,559	124,603
Retained earnings	87,643	69,318
Accumulated other comprehensive loss	(8)	(5)
Total shareholders' equity	220,194	193,916
Total liabilities and shareholders' equity	$ 269,064	$ 217,380