Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Feb. 29, 2012		Feb. 28, 2011
Cash flows from operating activities:
Net loss	$ (2,610)		$ (3,229)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock compensation expense	519		735
Provision for doubtful accounts	(9)		24
Loss on disposal of asset	0		9
Gain on sale of long-term investment	(990)		0
Depreciation and amortization	388		432
Changes in operating assets and liabilities:
Accounts receivable	535		(1,380)
Inventories	(694)		(1,027)
Prepaid expenses and other	(90)		242
Accounts payable	106		439
Accrued expenses and deferred revenue	(274)		(666)
Income tax payable	(44)		0
Deferred lease commitment	(43)		(31)
Net cash used in operating activities	(3,206)		(4,452)
Cash flows from investing activities:
Proceeds from sale of investments	1,375		0
Purchase of property and equipment	(20)		(6)
Net cash provided by (used in) investing activities	1,355		(6)
Cash flows from financing activities:
Line of credit borrowings, net	716		0
Proceeds from issuance of common stock and excercise of stock options	114		246
Net cash provided by financing activities	830		246
Effect of exchange rates on cash	(24)		254
Net decrease in cash and cash equivalents	(1,045)		(3,958)
Cash and cash equivalents, beginning of period	4,020	[1]	7,766
Cash and cash equivalents, end of period	$ 2,975		$ 3,808

[1] The condensed consolidated balance sheet at May 31, 2011 has been derived from the audited consolidated financial statements at that date.