Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2016	Feb. 28, 2015	Feb. 27, 2016	Feb. 28, 2015
Net sales	$ 31,291	$ 33,471	$ 102,448	$ 102,011
Cost of sales	21,541	23,671	71,001	71,091
Gross profit	9,750	9,800	31,447	30,920
Selling, general, and administrative expenses	$ 12,471	12,563	37,938	36,366
Gain on disposal of assets		(14)	(244)	(5)
Operating loss	$ (2,721)	(2,749)	(6,247)	(5,441)
Other (income) expense:
Investment/interest income	(131)	(239)	(433)	(744)
Foreign exchange (gain) loss	265	(275)	108	(285)
Other, net	(40)	(6)	(53)	(22)
Total other income	94	(520)	(378)	(1,051)
Loss from continuing operations before income taxes	(2,815)	(2,229)	(5,869)	(4,390)
Income tax provision (benefit)	111	(31)	742	(965)
Loss from continuing operations	$ (2,926)	$ (2,198)	$ (6,611)	(3,425)
Income from discontinued operations, net of tax				87
Net loss	$ (2,926)	$ (2,198)	$ (6,611)	(3,338)
Foreign currency translation gain (loss), net of tax	240	(2,188)	(1,912)	(6,149)
Fair value adjustments on investments gain (loss)	(47)	5	(79)	30
Comprehensive loss	$ (2,733)	$ (4,381)	$ (8,602)	$ (9,457)
Weighted average number of shares:
Common shares - Diluted	12,842	13,745	13,117	13,887
Common Stock [Member]
Net income (loss) per Common share - Basic:
Loss from continuing operations	$ (0.23)	$ (0.16)	$ (0.51)	$ (0.25)
Income from discontinued operations				0.01
Total loss per Common share - Basic	(0.23)	(0.16)	(0.51)	(0.24)
Net income (loss) per Common share - Diluted:
Loss from continuing operations	(0.23)	(0.16)	(0.51)	(0.25)
Income from discontinued operations				0.01
Total loss per common share - Diluted	$ (0.23)	$ (0.16)	$ (0.51)	$ (0.24)
Weighted average number of shares:
Common shares - Basic	10,701	11,604	10,976	11,733
Common shares - Diluted	10,701	11,604	10,976	11,733
Dividends per common share	$ 0.060	$ 0.060	$ 0.180	$ 0.180
Common Class B [Member]
Net income (loss) per Common share - Basic:
Loss from continuing operations	(0.21)	(0.15)	(0.46)	(0.22)
Income from discontinued operations				0.01
Total loss per Common share - Basic	(0.21)	(0.15)	(0.46)	(0.21)
Net income (loss) per Common share - Diluted:
Loss from continuing operations	(0.21)	(0.15)	(0.46)	(0.22)
Income from discontinued operations				0.01
Total loss per common share - Diluted	$ (0.21)	$ (0.15)	$ (0.46)	$ (0.21)
Weighted average number of shares:
Common shares - Basic	2,141	2,141	2,141	2,154
Common shares - Diluted	2,141	2,141	2,141	2,154
Dividends per common share	$ 0.054	$ 0.054	$ 0.162	$ 0.162