Audited Consolidated Statement 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. 31, 2014			$ 702	$ 66,141	$ (14)	$ 97,959	$ 10,057	$ 174,845
Beginning Balance (in shares) at May. 31, 2014	11,835	2,191
Comprehensive loss
Net loss						(5,559)		(5,559)
Foreign currency translation							(6,504)	(6,504)
Fair value adjustments on investments							22	22
Share-based compensation:
Stock options				726				726
Common stock:
Options exercised			2	322				324
Options exercised, shares	47
Converted Class B to Common (in shares)	50	(50)
Repurchase of common stock					(3,945)			(3,945)
Cancellation of treasury stock			(20)	(3,939)	3,959
Cancellation of treasury stock (in shares)	(401)
Other				2		1		3
Other (in shares)	(1)
Dividends paid to:
Common						(2,794)		(2,794)
Class B						(466)		(466)
Ending Balance at May. 30, 2015			684	63,252		89,141	3,575	156,652
Ending 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
Common stock:
Options exercised			1	141				142
Options exercised, 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						(2,615)		(2,615)
Class B						(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
Common stock:
Options exercised				30				30
Options exercised, shares	5
Converted Class B to Common (in shares)	4	(4)
Dividends paid to:
Common						(2,567)		(2,567)
Class B						(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	10,712	2,137