DEFERRED TAX ASSETS (LIABILITIES) (Details) - USD ($) $ in Thousands	May. 31, 2015	May. 31, 2014
Deferred tax assets
Net operating loss carryforwards	$ 7,498	$ 7,271
Tax credit carryforwards	254	254
Receivables allowances	7	7
Vacation pay accrual	4	9
Differences in book and tax basis of assets of acquired businesses	(994)	(859)
Total gross deferred tax assets	6,804	6,719
Valuation allowance	(6,804)	(6,719)
Net deferred tax asset	$ 0	$ 0