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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Feb. 29, 2012
Feb. 28, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (17,654) $ (22,563)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 1,779 2,020
Gain on sale of idle property, plant and equipment (2,500)  
Change in assets and liabilities:    
Accrued interest receivable 3 2
Accounts receivable (239) (10)
Inventories (450) (1,334)
Other current assets 849 1,469
Accounts payable, trade (299) 221
Accrued liabilities 2,287 1,488
Other, net 212 13
Net cash used in operating activities (16,012) (18,694)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from principal payments of U.S. Treasury Bills 53,983 189,947
Purchase of U.S. Treasury Bills (45,989) (170,951)
Proceeds from sale of idle property, plant and equipment 4,071  
Purchase of property, plant and equipment (493) (528)
Other, net (29) (104)
Net cash provided by investing activities 11,543 18,364
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash dividends paid (1,511) (4,531)
Net cash used in financing activities (1,511) (4,531)
Net decrease in cash (5,980) (4,861)
Cash at beginning of period 9,727 9,268
Cash at end of period $ 3,747 $ 4,407