Note 15 - Changes to Stockholders' Equity - Changes Occurred in Stockholders' Equity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 01, 2019	May 26, 2018	Jun. 01, 2019	May 26, 2018
Balance			$ 190,309,000
Net income (loss) for the period	$ 445,000	$ 4,289,000	1,053,000	$ 3,376,000
Balance	187,166,000		187,166,000
Common Stock [Member]
Balance	52,598,000	53,776,000	52,638,000	53,690,000
Issuance of common stock	64,000	61,000	281,000	254,000
Purchase and retirement of common stock	$ (400,000)	$ (101,000)	$ (657,000)	$ (208,000)
Balance, shares (in shares)	10,519,640	10,755,291	10,527,636	10,737,950
Issuance of common stock, shares (in shares)	12,729	12,165	56,201	50,806
Purchase and retirement of common stock, shares (in shares)	(80,024)	(20,334)	(131,492)	(41,634)
Balance, shares (in shares)	10,452,345	10,747,122	10,452,345	10,747,122
Balance	$ 52,262,000	$ 53,736,000	$ 52,262,000	$ 53,736,000
Paid in Capital [Member]
Balance	0	499,000	0	962,000
Issuance of common stock	21,000	56,000	(97,000)	(53,000)
Purchase and retirement of common stock	(242,000)	(477,000)	(379,000)	(1,136,000)
Stock based compensation	221,000	304,000	476,000	609,000
Balance	0	382,000	0	382,000
Retained Earnings [Member]
Balance	138,687,000	137,827,000	140,009,000	139,378,000
Purchase and retirement of common stock	(693,000)	0	(1,311,000)	0
Cumulative effect of a change in accounting principal	0	0	(21,000)	0
Reclassification of certain tax effects from accumulated other comprehensive loss	0	0	0	545,000
Net income (loss) for the period	445,000	4,289,000	1,053,000	3,376,000
Cash dividends	(1,312,000)	(1,182,000)	(2,603,000)	(2,365,000)
Balance	137,127,000	140,934,000	137,127,000	140,934,000
AOCI Attributable to Parent [Member]
Balance	(2,280,000)	(3,036,000)	(2,338,000)	(2,570,000)
Reclassification of certain tax effects from accumulated other comprehensive loss	0	0	0	(545,000)
Amortization of pension costs, net of tax	57,000	80,000	115,000	159,000
Balance	$ (2,223,000)	$ (2,956,000)	$ (2,223,000)	$ (2,956,000)