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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2012
May 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (19,365) $ (26,627)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 2,359 2,683
Gain on sale of idle property, plant and equipment (3,184)  
Change in assets and liabilities:    
Accrued interest receivable 5 (1)
Accounts receivable 278 (1,699)
Inventories 361 (1,964)
Other current assets 560 1,077
Accounts payable, trade (96) 256
Accrued liabilities 61 772
Other, net 424 (72)
Net cash used in operating activities (18,597) (25,575)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from principal payments of U.S. Treasury Bills 67,979 227,939
Purchase of U.S. Treasury Bills (49,988) (194,943)
Proceeds from sale of idle property, plant and equipment 5,054  
Purchase of property, plant and equipment (614) (816)
Other, net (40) (105)
Net cash provided by investing activities 22,391 32,075
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash dividends paid (1,510) (6,041)
Net cash used in financing activities (1,510) (6,041)
Net increase in cash 2,284 459
Cash at beginning of year 9,727 9,268
Cash at end of year $ 12,011 $ 9,727