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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2017
May 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 5 $ 1,678
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation 1,026 1,057
Amortization of debt financing costs 103 82
Share-based compensation 161 82
Bad debt recoveries   (250)
Net gain on sale of property, plant and equipment (1,280)  
Change in assets and liabilities:    
Accounts receivable 2,402 385
Inventories (852) (2,262)
Workers' compensation security deposit 923 438
Other current assets (232) 116
Accounts payable, trade (60) 888
Accrued liabilities 414 2,026
Other, net 258 (387)
Net cash from operating activities 2,868 3,853
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from sale of property, plant and equipment 2,212  
Purchase of property, plant and equipment (1,355) (1,132)
Other, net   (57)
Net cash from investing activities 857 (1,189)
Net increase in cash 3,725 2,664
Cash at beginning of year 7,659 4,995
Cash at end of year $ 11,384 $ 7,659