CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 46,277	$ 91,332
Short-term investments	120,506	51,561
Receivables (net of allowances of $525 in 2018 and $272 in 2017)	48,164	40,568
Inventories	44,121	39,010
Prepaid expenses and other current assets	5,138	4,997
Net deferred tax assets, current	0	5,644
Current assets of discontinued operations	42	66
Total current assets	264,248	233,178
Long-term investments	19,240	22,171
Investments in unconsolidated affiliates	3,846	2,850
Property and equipment, net	35,419	34,260
Intangible assets, net	1,017	1,171
Net deferred tax assets, non-current	7,913	4,392
Other assets	9,420	7,624
Total assets	341,103	305,646
Current liabilities:
Accounts payable	11,775	7,517
Accrued payroll and related expenses	11,280	9,606
Accrued taxes	1,456	2,151
Current liabilities of discontinued operations	66	85
Other accrued liabilities	16,234	11,006
Deferred revenue	816	1,415
Warranty reserve	2,253	1,663
Total current liabilities	43,880	33,443
Non-current liabilities:
Deferred revenue	1,524	1,460
Warranty reserve	3,037	2,695
Net deferred tax liabilities	203	234
Notes payable, less current portion	177	278
Other non-current liabilities	1,589	1,312
Total non-current liabilities	6,530	5,979
Total liabilities	50,410	39,422
Commitments and contingencies (Note 13)
Shareholders' equity:
Preferred stock, no par value: 5,000,000 shares authorized; no shares issued and outstanding in 2018 and 2017	0	0
Common stock, no par value: 35,000,000 shares authorized; 22,698,000 and 22,540,000 shares issued and outstanding in 2018 and 2017, respectively	147,000	135,932
Retained earnings	143,870	130,304
Accumulated other comprehensive loss	(177)	(12)
Total shareholders' equity	290,693	266,224
Total liabilities and shareholders' equity	$ 341,103	$ 305,646