Deferred tax assets (liabilities) were comprised of the following (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013
Deferred tax assets (liabilities) were comprised of the following:
Net operating loss carryforwards	$ 7,271	$ 7,190
Tax credit carryforwards	254	254
Receivables allowances	7	11
Vacation pay accrual	9	10
Other accruals	0	0
Depreciation	37	35
Differences in book and tax basis of assets of acquired businesses	(859)	(1,050)
Total gross deferred tax assets	6,719	6,450
Valuation allowance.	(6,719)	(6,450)
Net deferred tax asset	$ 0	$ 0