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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (3,592) $ (5,193)
Adjustments to reconcile net loss to net cash from operating activities:    
Depreciation 887 1,032
Gain on sale of idle property, plant and equipment (162) (1,411)
Change in assets and liabilities:    
Restricted cash   (600)
Accrued interest receivable 1 3
Accounts receivable 1,358 2,843
Inventories (1,233) (2,352)
Other current assets (281) (1,067)
Accounts payable, trade (1,581) (382)
Accrued liabilities 3,556 1,374
Other, net (434) (37)
Net cash from operating activities (1,481) (5,790)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from principal payments of U.S. Treasury Bills 16,998 34,991
Purchase of U.S. Treasury Bills (17,999) (31,994)
Proceeds from note receivable 24  
Proceeds from sale of idle property, plant and equipment 490 348
Purchase of property, plant and equipment (460) (26)
Other, net 229 130
Net cash from investing activities (718) 3,449
Net decrease in cash (2,199) (2,341)
Cash at beginning of period 11,838 12,011
Cash at end of period 9,639 9,670
NON-CASH TRANSACTIONS:    
Note receivable from sale of idle property, plant and equipment   $ 1,700