Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Nov. 25, 2017						10,737,950
Balance at Nov. 25, 2017						$ 53,690	$ 962	$ 139,378	$ (2,570)	$ 191,460
Net income (loss)						0	0	8,218	0	8,218
Amortization of defined benefit plan costs, net of tax						0	0	0	319	319
Actuarial adjustments to defined benefit plans, net of tax						0	0	0	458	458
Reclassification of certain tax effects						0	0	545	(545)
Regular dividends						$ 0	0	(5,041)	0	(5,041)
Issuance of common stock (in shares)						63,403
Issuance of common stock						$ 317	65	0	0	382
Purchase and retirement of common stock (in shares)						(273,717)
Purchase and retirement of common stock						$ (1,369)	(2,160)	(3,091)	0	(6,620)
Stock-based compensation						$ 0	1,133	0	0	1,133
Balance (in shares) at Nov. 24, 2018						10,527,636
Balance at Nov. 24, 2018	$ 0	$ 0	$ (21)	$ 0	$ (21)	$ 52,638	0	140,009	(2,338)	190,309
Net income (loss)						0	0	(1,928)	0	(1,928)
Amortization of defined benefit plan costs, net of tax						0	0	0	230	230
Actuarial adjustments to defined benefit plans, net of tax						0	0	0	872	872
Regular dividends						$ 0	0	(5,133)	0	(5,133)
Issuance of common stock (in shares)						102,303
Purchase and retirement of common stock (in shares)						(513,649)
Purchase and retirement of common stock						$ (2,568)	(980)	(3,797)	0	(7,345)
Stock-based compensation						0	958	0	0	958
Issuance of common stock						$ 511	217	0	0	$ 728
Balance (in shares) at Nov. 30, 2019						10,116,290				10,116,290
Balance at Nov. 30, 2019	$ 0	$ 0	$ (3,785)	$ 0	$ (3,785)	$ 50,581	195	129,130	(1,236)	$ 178,670
Net income (loss)						0	0	(10,421)	0	(10,421)
Amortization of defined benefit plan costs, net of tax						0	0	0	98	98
Actuarial adjustments to defined benefit plans, net of tax						0	0	0	(256)	(256)
Regular dividends						$ 0	0	(4,545)	0	(4,545)
Issuance of common stock (in shares)						43,218
Purchase and retirement of common stock (in shares)						(216,721)
Purchase and retirement of common stock						$ (1,083)	(684)	(669)	0	(2,436)
Stock-based compensation						0	420	0	0	420
Issuance of common stock						$ 216	69	0	0	$ 285
Balance (in shares) at Nov. 28, 2020						9,942,787				9,942,787
Balance at Nov. 28, 2020						$ 49,714	$ 0	$ 109,710	$ (1,394)	$ 158,030