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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (10,414) $ (11,864)
Adjustments to reconcile net loss to net cash from operating activities:    
Depreciation 1,320 1,716
Amortization of debt financing costs 13  
Reduction in inventory value of discontinued operations 910  
Increase in allowance for doubtful accounts 536  
Gain on sale of assets associated with discontinued operations (670)  
Gain on sale of idle property, plant and equipment (243) (706)
Change in assets and liabilities:    
Restricted cash   600
Accrued interest receivable   1
Accounts receivable 5,205 (7,557)
Inventories 1,301 (2,598)
Workers' compensation security deposit 956 (91)
Other current assets 178 (191)
Accounts payable, trade (2,106) 1,464
Accrued liabilities (1,024) 2,576
Other, net (297) (946)
Net cash from operating activities (4,335) (17,596)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from principal payments of U.S. Treasury Bills   32,998
Purchase of U.S. Treasury Bills   (28,999)
Proceeds from note receivable 1,631 47
Proceeds from sale of assets associated with discontinued operations 2,331  
Proceeds from sale of idle property, plant and equipment 1,941 1,941
Purchase of property, plant and equipment (473) (753)
Other, net 125 221
Net cash from investing activities 5,555 5,455
CASH FLOWS FROM FINANCING ACTIVITIES:    
Life insurance loans   6,334
Payments related to debt financing costs (234)  
Repayment of life insurance loans (2,022)  
Net cash from financing activities (2,256) 6,334
Net decrease in cash (1,036) (5,807)
Cash at beginning of year 6,031 11,838
Cash at end of year $ 4,995 $ 6,031