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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
OPERATIONS        
Net sales $ 58,684 $ 49,667 $ 107,426 $ 99,271
Cost of sales 51,457 44,509 95,556 90,072
Gross profit 7,227 5,158 11,870 9,199
Selling and administrative expenses 5,400 5,008 10,859 10,188
Operating income (loss) 1,827 150 1,011 (989)
Interest expense (79) (93) (158) (187)
Interest income   24   48
Income (loss) from continuing operations before income taxes 1,748 81 853 (1,128)
Income tax expense 0 0 0 0
Income (loss) from continuing operations 1,748 81 853 (1,128)
(Loss) income from discontinued operations, net of income taxes (42) (3,525) 19 (6,089)
Net income (loss) $ 1,706 $ (3,444) $ 872 $ (7,217)
Basic income (loss) per share $ 0.20 $ (0.41) $ 0.10 $ (0.86)
Basic income (loss) per share from continuing operations 0.21 0.01 $ 0.10 (0.13)
Basic loss per share from discontinued operations $ (0.01) $ (0.42)   $ (0.73)
Weighted average number of common shares outstanding 8,391,244 8,391,244 8,391,244 8,391,244