CALCULATION OF EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2016	Feb. 28, 2015	Feb. 27, 2016	Feb. 28, 2015
Basic and Diluted EPS:
Loss from continuing operations	$ (2,926)	$ (2,198)	$ (6,611)	$ (3,425)
Less dividends:
Undistributed losses	(3,684)	(3,005)	(8,932)	(5,878)
Undistributed losses, diluted	(3,684)	(3,005)	(8,932)	(5,878)
Income from discontinued operations, net of tax				87
Net loss	$ (2,926)	$ (2,198)	$ (6,611)	$ (3,338)
Weighted average number of shares:
Common shares - Diluted	12,842	13,745	13,117	13,887
Discontinued Operations [Member]
Less dividends:
Undistributed losses	$ (758)	$ (807)	$ (2,321)	$ (2,366)
Undistributed losses, diluted	(758)	(807)	(2,321)	(2,366)
Common Stock [Member]
Less dividends:
Common stock	642	691	1,973	2,103
Undistributed losses	(3,122)	(2,577)	(7,598)	(5,045)
Undistributed losses, diluted	$ (3,122)	$ (2,577)	$ (7,598)	$ (5,045)
Loss from continuing operations per share:
Loss from continuing operations - basic	$ (0.23)	$ (0.16)	$ (0.51)	$ (0.25)
Loss from continuing operations - diluted	(0.23)	(0.16)	(0.51)	(0.25)
Income from discontinued operations per share:
Income from discontinued operations - basic				0.01
Income from discontinued operations - diluted				0.01
Net loss per share:
Total loss per Common share - Basic	(0.23)	(0.16)	(0.51)	(0.24)
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
Common Stock [Member] | Discontinued Operations [Member]
Less dividends:
Common stock	$ 642	$ 691	$ 1,973	$ 2,103
Undistributed losses	(642)	(692)	(1,973)	(2,031)
Undistributed losses, diluted	(642)	(692)	(1,973)	(2,031)
Common Class B [Member]
Less dividends:
Common stock	116	116	348	350
Undistributed losses	(562)	(428)	(1,334)	(833)
Undistributed losses, diluted	$ (562)	$ (428)	$ (1,334)	$ (833)
Loss from continuing operations per share:
Loss from continuing operations - basic	$ (0.21)	$ (0.15)	$ (0.46)	$ (0.22)
Loss from continuing operations - diluted	(0.21)	(0.15)	(0.46)	(0.22)
Income from discontinued operations per share:
Income from discontinued operations - basic				0.01
Income from discontinued operations - diluted				0.01
Net loss per share:
Total loss per Common share - Basic	(0.21)	(0.15)	(0.46)	(0.21)
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
Common Class B [Member] | Discontinued Operations [Member]
Less dividends:
Common stock	$ 116	$ 116	$ 348	$ 350
Undistributed losses	(116)	(115)	(348)	(335)
Undistributed losses, diluted	$ (116)	$ (115)	$ (348)	$ (335)