CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 68,835	$ 62,143
Restricted cash	6,193	14,603
Short-term investments, at fair value	24,533	88,649
Accounts receivable, net of allowances of $333 and $323 at March 31, 2015 and March 31, 2014, respectively	22,124	34,317
Unbilled costs and fees	1,848	2,491
Inventories	40,983	32,935
Prepaid expenses and other current assets	10,701	5,459
Deferred income taxes	2,486	4,775
Total current assets	177,703	245,372
Building, equipment and leasehold improvements, net	8,711	12,969
Restricted cash	208	313
Deferred income taxes	5,952	6,318
Other assets	534	539
Total assets	193,108	265,511
Current liabilities:
Accounts payable	7,200	10,618
Accrued salaries and benefits	6,769	10,805
Accrued warranty costs	159	404
Accrued income taxes		2,338
Deferred revenue	7,355	10,934
Customer deposits	13,956	16,589
Current portion of lease financing liability		1,511
Other current liabilities	5,736	9,292
Total current liabilities	41,175	62,491
Lease financing liability, net of current portion		1,404
Deferred revenue	1,019	3,941
Other long-term liabilities	507	280
Total liabilities	42,701	68,116
Commitments and contingencies (Notes 2 and 9)
Stockholders' equity:
Preferred stock, no par value Authorized-100,000 shares Issued-None
Common stock, $0.66 2/3 par value Authorized-20,000,000 shares Issued and outstanding-7,193,247 shares at March 31, 2015 and 7,884,015 shares at March 31, 2014	4,795	5,255
Capital in excess of par value	3,334	35,236
Accumulated other comprehensive income (loss), net	(11)	13
Retained earnings	142,289	156,891
Total stockholders' equity	150,407	197,395
Total liabilities and stockholders' equity	$ 193,108	$ 265,511