CALCULATION OF EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 26, 2016	Nov. 28, 2015	Nov. 26, 2016	Nov. 28, 2015
Numerator for Basic and Diluted EPS:
Net loss	$ (2,522)	$ (2,286)	$ (5,372)	$ (3,685)
Less dividends:
Undistributed losses	(3,279)	(3,043)	(6,887)	(5,248)
Undistributed losses, diluted	(3,279)	(3,043)	(6,887)	(5,248)
Common Stock [Member]
Less dividends:
Common stock	641	641	1,283	1,331
Undistributed losses	(2,779)	(2,580)	(5,836)	(4,473)
Undistributed losses, diluted	$ (2,779)	$ (2,580)	$ (5,836)	$ (4,473)
Denominator for Basic and Diluted EPS:
Common shares - Basic	10,703	10,742	10,703	11,114
Common shares - Diluted	10,703	10,742	10,703	11,114
Total loss per Common share - Basic	$ (0.20)	$ (0.18)	$ (0.43)	$ (0.28)
Total loss per common share - Diluted	$ (0.20)	$ (0.18)	$ (0.43)	$ (0.28)
Common Class B [Member]
Less dividends:
Common stock	$ 116	$ 116	$ 232	$ 232
Undistributed losses	(500)	(463)	(1,051)	(775)
Undistributed losses, diluted	$ (500)	$ (463)	$ (1,051)	$ (775)
Denominator for Basic and Diluted EPS:
Common shares - Basic	2,141	2,141	2,141	2,141
Common shares - Diluted	2,141	2,141	2,141	2,141
Total loss per Common share - Basic	$ (0.18)	$ (0.16)	$ (0.38)	$ (0.25)
Total loss per common share - Diluted	$ (0.18)	$ (0.16)	$ (0.38)	$ (0.25)