Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2011		Nov. 30, 2010
Cash flows from operating activities:
Net loss	$ (1,249)		$ (2,283)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock compensation expense	337		512
Provision for doubtful accounts	8		13
Loss on disposal of assets	0		2
Gain on sale of long-term investment	(990)		0
Depreciation and amortization	268		292
Changes in operating assets and liabilities:
Accounts receivable	(661)		(726)
Inventories	(622)		(600)
Prepaid expenses and other	(60)		271
Accounts payable	483		(191)
Accrued expenses and deferred revenue	151		(387)
Income tax payable	(55)		(19)
Deferred lease commitment	(29)		(20)
Net cash used in operating activities	(2,419)		(3,136)
Cash flows from investing activities:
Proceeds from sale of investments	1,375		0
Purchase of property and equipment	(18)		(3)
Net cash provided by (used in) investing activities	1,357		(3)
Cash flows from financing activities:
Proceeds from issuance of common stock and excercise of stock options	114		243
Net cash provided by financing activities	114		243
Effect of exchange rates on cash	54		190
Net decrease in cash and cash equivalents	(894)		(2,706)
Cash and cash equivalents, beginning of period	4,020	[1]	7,766
Cash and cash equivalents, end of period	$ 3,126		$ 5,060

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