Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Cash flows from operating activities:
Net loss	$ (3,419)	$ (3,389)	$ (3,373)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	601	709	947
Provision for doubtful accounts	0	16	15
Loss on disposal of asset	0	1	1
Gain on sale of long-term investment	0	(990)	0
Depreciation and amortization	322	491	573
Changes in operating assets and liabilities:
Accounts receivable	(206)	(1,285)	(501)
Inventories	702	(1,114)	(1,322)
Prepaid expenses and other	(7)	(42)	287
Accounts payable	243	570	(353)
Customer deposits and deferred revenue	1,477	331	(66)
Accrued expenses	58	(36)	(214)
Income tax payable	(5)	(78)	(94)
Deferred lease commitment	(76)	(59)	(42)
Net cash used in operating activities	(310)	(4,875)	(4,142)
Cash flows from investing activities:
Proceeds from sale of investments	0	1,375	0
Purchase of property and equipment	(127)	(45)	(15)
Net cash (used in) provided by investing activities	(127)	1,330	(15)
Cash flows from financing activities:
Line of credit (repayments) borrowings, net	(307)	1,408	0
Proceeds from issuance of common stock under private placement	1,138	0	0
Proceeds from issuance of common stock under employee plans	234	168	343
Net cash provided by financing activities	1,065	1,576	343
Effect of exchange rates on cash and cash equivalents	(377)	22	68
Net increase (decrease) in cash and cash equivalents	251	(1,947)	(3,746)
Cash and cash equivalents, beginning of year	2,073	4,020	7,766
Cash and cash equivalents, end of year	2,324	2,073	4,020
Supplemental Cash Flow Information:
Cash paid during the year for Income taxes:	64	62	51
Cash paid during the year for Interest:	$ 49	$ 4	$ 0