Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Feb. 25, 2017	May 28, 2016
Accounts receivable, allowance	$ 375	$ 364
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred Stock, issued	0	0
Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.05	$ 0.05
Common stock, issued	10,708	10,703
Common stock, outstanding	10,708	10,703
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.05	$ 0.05
Common stock, issued	2,141	2,141
Common stock, outstanding	2,141	2,141