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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (3,468) $ (6,845)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 544 615
Changes in assets and liabilities:    
Accrued interest receivable 2 7
Accounts receivable 188 884
Inventories (1,391) (1,554)
Other current assets (1,048) 183
Accounts payable, trade 964 (74)
Accrued liabilities 236 1,640
Other, net (30) (2)
Net cash used in operating activities (4,003) (5,146)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from principal payments of U.S. Treasury Bills 14,995 26,986
Purchase of U.S. Treasury Bills (13,997) (22,994)
Purchase of property, plant and equipment (15) (353)
Other, net 21 (48)
Net cash provided by investing activities 1,004 3,591
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash dividends paid    (755)
Net cash used in financing activities    (755)
Net decrease in cash (2,999) (2,310)
Cash at beginning of period 12,011 9,727
Cash at end of period $ 9,012 $ 7,417