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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (11,864) $ (10,513)
Adjustments to reconcile net loss to net cash from operating activities:    
Depreciation 1,716 2,002
Gain on sale of idle property, plant and equipment (706) (1,641)
Change in assets and liabilities:    
Restricted cash 600 (600)
Accrued interest receivable 1 3
Accounts receivable (7,557) (2,273)
Inventories (2,598) (373)
Workers' compensation security deposit (91) (195)
Other current assets (191) 150
Accounts payable, trade 1,464 379
Accrued liabilities 2,576 (853)
Other, net (946) (125)
Net cash from operating activities (17,596) (14,039)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from principal payments of U.S. Treasury Bills 32,998 58,988
Purchase of U.S. Treasury Bills (28,999) (45,993)
Proceeds from note receivable 47 22
Proceeds from sale of idle property, plant and equipment 1,941 819
Purchase of property, plant and equipment (753) (75)
Other, net 221 105
Net cash from investing activities 5,455 13,866
CASH FLOWS FROM FINANCING ACTIVITIES:    
Life insurance loan 6,334  
Net cash from financing activities 6,334  
Net decrease in cash (5,807) (173)
Cash at beginning of year 11,838 12,011
Cash at end of year 6,031 11,838
NON-CASH TRANSACTIONS:    
Note receivable from sale of idle property, plant and equipment   $ 1,700