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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 744 $ (834)
Adjustments to reconcile net income (loss) to net cash from operating activities:    
Depreciation 251 257
Amortization of debt financing costs 26 19
Share-based compensation 31  
Change in assets and liabilities:    
Accounts receivable 319 3,137
Inventories (435) (1,429)
Workers' compensation security deposit 256 717
Other current assets (634) (1,093)
Accounts payable, trade 227 624
Accrued liabilities 622 464
Other, net (41) (107)
Net cash from operating activities 1,366 1,755
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (569) (70)
Other, net (6) (8)
Net cash from investing activities (575) (78)
Net increase in cash 791 1,677
Cash at beginning of period 7,659 4,995
Cash at end of period $ 8,450 $ 6,672