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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
OPERATIONS        
Net sales $ 47,697 $ 38,109 $ 155,123 $ 137,380
Cost of sales 42,887 35,771 138,443 125,843
Gross profit 4,810 2,338 16,680 11,537
Selling and administrative expenses 5,246 5,159 16,105 15,347
Operating (loss) income (436) (2,821) 575 (3,810)
Interest expense (78) (92) (236) (279)
Interest income   2   50
(Loss) income from continuing operations before income taxes (514) (2,911) 339 (4,039)
Income tax expense 0 0 0 0
(Loss) income from continuing operations (514) (2,911) 339 (4,039)
(Loss) income from discontinued operations, net of income taxes (6) (86) 13 (6,175)
Net (loss) income $ (520) $ (2,997) $ 352 $ (10,214)
Basic (loss) income per share $ (0.06) $ (0.36) $ 0.04 $ (1.22)
Basic (loss) income per share from continuing operations $ (0.06) (0.35) $ 0.04 (0.48)
Basic loss per share from discontinued operations   $ (0.01)   $ (0.74)
Weighted average number of common shares outstanding 8,391,244 8,391,244 8,391,244 8,391,244