Note 15 - Changes to Stockholders' Equity - Changes Occurred in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 26, 2023	Aug. 27, 2022	Aug. 26, 2023	Aug. 27, 2022
Beginning of period			$ 195,609
End of period	$ 188,777		188,777
Net income for the period	(2,591)	$ 7,628	930	$ 60,319
Amortization of pension costs, net of tax	(31)	(33)	(98)	(99)
Common Stock [Member]
Beginning of period	43,900	46,396	44,759	48,811
Issuance of common stock	101	98	288	222
Purchase and retirement of common stock	(201)	(430)	(1,247)	(2,969)
End of period	$ 43,800	$ 46,064	$ 43,800	$ 46,064
Beginning of period (in shares)	8,779,912	9,279,268	8,951,839	9,762,125
Issuance of common stock (in shares)	19,996	19,568	57,406	44,544
Purchase and retirement of common stock (in shares)	(40,143)	(86,096)	(249,480)	(593,929)
End of period (in shares)	8,759,765	9,212,740	8,759,765	9,212,740
Issuance of common stock	$ (101)	$ (98)	$ (288)	$ (222)
Additional Paid-in Capital [Member]
Beginning of period	0	0	0	113
Issuance of common stock	2	65	12	117
End of period	0	0	0	0
Issuance of common stock	(2)	(65)	(12)	(117)
Purchase and retirement of common stock	(210)	(207)	(624)	(629)
Stock based compensation	212	142	636	399
Retained Earnings [Member]
Beginning of period	149,393	145,471	150,800	115,631
End of period	145,031	150,553	145,031	150,553
Purchase and retirement of common stock	(196)	(982)	(2,293)	(6,663)
Net income for the period	(2,591)	7,628	930	60,319
Cash dividends declared	(1,575)	(1,564)	(4,406)	(18,734)
AOCI Attributable to Parent [Member]
Beginning of period	(108)	(1,726)	50	(1,823)
End of period	(54)	(1,678)	(54)	(1,678)
Amortization of pension costs, net of tax	23	48	70	145
AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning of period	$ 31	$ 0	$ (174)	$ 0