CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 85,653	$ 88,323
Short-term investments	52,291	41,474
Receivables (net of allowances of $303 at December 31, 2016 and $479 at March 31, 2016)	35,245	35,148
Inventories	39,192	35,131
Prepaid expenses and other current assets	6,225	6,351
Net deferred tax assets, current	4,881	4,810
Current assets of discontinued operations	66	961
Total current assets	223,553	212,198
Long-term investments	21,738	22,458
Investment in unconsolidated affiliates	3,000	2,705
Property and equipment, net	33,709	26,842
Intangible assets, net	1,209	1,324
Net deferred tax assets, non-current	4,492	3,903
Other assets	6,290	1,950
Total assets	293,991	271,380
Current liabilities:
Accounts payable	8,922	7,292
Accrued payroll and related expenses	6,184	8,349
Accrued taxes	477	1,145
Current liabilities of discontinued operations	87	112
Other accrued liabilities	10,091	9,393
Deferred revenue	1,560	1,600
Warranty reserve	1,577	1,281
Total current liabilities	28,898	29,172
Non-current liabilities:
Deferred revenue	1,601	2,274
Warranty reserve	2,616	1,927
Net deferred tax liabilities	242	384
Notes payable, less current portion	303	379
Other non-current liabilities	1,170	932
Total non-current liabilities	5,932	5,896
Total liabilities	34,830	35,068
Commitments and contingencies (Note 12)
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; 22,537,000 and 22,408,000 shares issued and outstanding at December 31, 2016 and March 31, 2016, respectively	133,262	127,016
Retained earnings	125,910	109,303
Accumulated other comprehensive loss	(11)	(7)
Total shareholders' equity	259,161	236,312
Total liabilities and shareholders' equity	$ 293,991	$ 271,380