Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020
Operating activities:
Net income (loss)	$ 228	$ (93)	$ (230)	$ (558)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	849	856	2,595	2,514
Inventory provisions	265	221	717	502
(Gain) loss on disposal of assets	(6)		(6)	1
Share-based compensation expense	150	157	529	527
Deferred income taxes	3	76	(50)	51
Change in assets and liabilities:
Accounts receivable	(837)	(760)	(1,004)	1,066
Inventories	133	(754)	(875)	(4,173)
Prepaid expenses and other assets	428	(56)	156	146
Accounts payable	496	(726)	(2,027)	(2,091)
Accrued liabilities	873	152	4,285	(238)
Other	216	2	(222)	(107)
Net cash provided by (used in) operating activities	2,798	(925)	3,868	(2,360)
Investing activities:
Capital expenditures	(555)	(430)	(1,835)	(1,244)
Proceeds from maturity of investments			16,000	8,000
Purchases of investments			(9,000)	(13,000)
Net cash (used in) provided by investing activities	(555)	(430)	5,165	(6,244)
Financing activities:
Proceeds from issuance of common stock				59
Cash dividends paid	(780)	(776)	(2,340)	(2,326)
Payment of financing lease principal	(45)	(46)	(136)	(121)
Net cash used in financing activities	(825)	(822)	(2,476)	(2,388)
Effect of exchange rate changes on cash and cash equivalents	(34)	(2)	1,315	(152)
Increase (decrease) in cash and cash equivalents	1,384	(2,179)	7,872	(11,144)
Cash and cash equivalents at beginning of period	37,023	33,054	30,535	42,019
Cash and cash equivalents at end of period	$ 38,407	$ 30,875	$ 38,407	$ 30,875