Note 16 - Changes to Stockholders' Equity - Changes Occurred in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 28, 2021	Aug. 29, 2020	Aug. 28, 2021	Aug. 29, 2020
Balance			$ 158,030
Net income (loss) for the period	$ 3,016	$ 2,178	13,001	$ (16,964)
Balance	159,447		159,447
Common Stock [Member]
Balance	49,262	49,977	49,714	50,581
Issuance of common stock	23	80	143	198
Forfeited shares	0	0	0	(35)
Purchase and retirement of common stock	$ (506)	$ (174)	$ (1,078)	$ (861)
Balance, shares (in shares)	9,852,359	9,995,356	9,942,787	10,116,291
Issuance of common stock, shares (in shares)	4,587	16,064	28,623	39,572
Forfeited shares (in shares)	0	0	0	(7,000)
Purchase and retirement of common stock, shares (in shares)	(101,100)	(34,907)	(215,564)	(172,350)
Balance, shares (in shares)	9,755,846	9,976,513	9,755,846	9,976,513
Balance	$ 48,779	$ 49,883	$ 48,779	$ 49,883
Paid in Capital [Member]
Balance	0	0	0	195
Issuance of common stock	71	(21)	165	19
Forfeited shares	0	0	0	35
Purchase and retirement of common stock	(119)	(99)	(275)	(563)
Stock based compensation	48	120	110	314
Balance	0	0	0	0
Retained Earnings [Member]
Balance	112,325	103,391	109,710	129,130
Purchase and retirement of common stock	(2,017)	(27)	(4,432)	(332)
Cumulative effect of a change in accounting principal	0	0	0	(3,785)
Net income (loss) for the period	3,016	2,178	13,001	(16,964)
Cash dividends declared	(1,366)	(799)	(6,321)	(3,306)
Balance	111,958	104,743	111,958	104,743
AOCI Attributable to Parent [Member]
Balance	(1,325)	(1,187)	(1,394)	(1,236)
Amortization of pension costs, net of tax	35	25	104	74
Balance	$ (1,290)	$ (1,162)	$ (1,290)	$ (1,162)