Audited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Common Class B [Member]	Par value [Member]	Additional Paid-In Capital [Member]	Common Stock in Treasury [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning Balance at May. 30, 2015			$ 684	$ 63,252		$ 89,141	$ 3,575	$ 156,652
Beginning Balance (in shares) at May. 30, 2015	11,530	2,141
Comprehensive loss
Net loss						(6,766)		(6,766)
Foreign currency translation							(759)	(759)
Fair value adjustments on investments							(44)	(44)
Share-based compensation:
Stock options				548				548
Options exercised			1	141				142
Options exercised (in shares)	28
Repurchase of common stock					$ (5,015)			(5,015)
Cancellation of treasury stock			(43)	(4,972)	$ 5,015
Cancellation of treasury stock (in shares)	(855)
Other						(4)		(4)
Dividends paid to:
Common ($0.24 per share)						(2,615)		(2,615)
Class B ($0.22 per share)						(464)		(464)
Ending Balance at May. 28, 2016			642	58,969		79,292	2,772	141,675
Ending Balance (in shares) at May. 28, 2016	10,703	2,141
Comprehensive loss
Net loss						(6,928)		(6,928)
Foreign currency translation							90	90
Fair value adjustments on investments							54	54
Share-based compensation:
Stock options				437				437
Options exercised				30				30
Options exercised (in shares)	5
Converted Class B to Common (in shares)	4	(4)
Dividends paid to:
Common ($0.24 per share)						(2,567)		(2,567)
Class B ($0.22 per share)						(464)		(464)
Ending Balance at May. 27, 2017			642	59,436		69,333	2,916	132,327
Ending Balance (in shares) at May. 27, 2017		2,137
Comprehensive loss
Net loss						3,822		3,822
Foreign currency translation							1,580	1,580
Fair value adjustments on investments							(130)	(130)
Share-based compensation:
Restricted stock				98				98
Stock options				435				435
Options exercised			1	96				97
Options exercised (in shares)	16
Restricted stock issuance			4	(4)
Restricted stock issuance (in shares)	78
Dividends paid to:
Common ($0.24 per share)						(2,586)		(2,586)
Class B ($0.22 per share)						(462)		(462)
Ending Balance at Jun. 02, 2018			$ 647	$ 60,061		$ 70,107	$ 4,366	$ 135,181
Ending Balance (in shares) at Jun. 02, 2018		2,137