Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (10,214)us-gaap_NetIncomeLoss	$ (9,304)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	1,034us-gaap_Depreciation	1,304us-gaap_Depreciation
Reduction in inventory value of discontinued operations	901us-gaap_InventoryWriteDown
Gain on sale of assets associated with discontinued operations	(670)
Gain on sale of idle property, plant and equipment		(462)
Change in assets and liabilities:
Restricted cash		600
Accrued interest receivable		1
Accounts receivable	7,642	(1,723)
Inventories	928us-gaap_IncreaseDecreaseInInventories	(2,502)us-gaap_IncreaseDecreaseInInventories
Workers' compensation security deposit	551
Other current assets	(211)	(32)
Accounts payable, trade	(3,382)	118
Accrued liabilities	(1,077)	3,400
Other, net	(516)	(527)
Net cash used for operating activities	(5,014)	(9,127)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from principal payments of U.S. Treasury Bills		30,998
Purchase of U.S. Treasury Bills		(28,999)
Proceeds from note receivable	1,631	35
Proceeds from sale of assets associated with discontinued operations	2,331
Proceeds from sale of idle property, plant and equipment		958
Purchase of property, plant and equipment	(178)	(649)
Other, net	132	221
Net cash from investing activities	3,916	2,564
Net decrease in cash	(1,098)	(6,563)
Cash at beginning of period	6,031us-gaap_Cash	11,838us-gaap_Cash
Cash at end of period	$ 4,933us-gaap_Cash	$ 5,275us-gaap_Cash

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