Note 15 - Changes to Stockholders' Equity - Changes Occurred in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 29, 2020	Aug. 31, 2019	Aug. 29, 2020	Aug. 31, 2019
Balance			$ 178,670
Balance	$ 153,464		153,464
Net income (loss) for the period	2,178	$ 2,157	(16,964)	$ 3,210
Common Stock [Member]
Balance	49,977	52,262	50,581	52,638
Issuance of common stock	80	58	198	339
Forfeited shares	0	0	(35)
Purchase and retirement of common stock	(174)	(1,742)	(861)	(2,399)
Balance	$ 49,883	$ 50,578	$ 49,883	$ 50,578
Balance, shares (in shares)	9,995,356	10,452,345	10,116,291	10,527,636
Issuance of common stock, shares (in shares)	16,064	11,734	39,572	67,935
Forfeited shares (in shares)	0	0	(7,000)	0
Purchase and retirement of common stock, shares (in shares)	(34,907)	(348,383)	(172,350)	(479,875)
Balance, shares (in shares)	9,976,513	10,115,696	9,976,513	10,115,696
Paid in Capital [Member]
Balance	$ 0	$ 0	$ 195	$ 0
Issuance of common stock	(21)	28	19	(69)
Forfeited shares	0	0	35	0
Purchase and retirement of common stock	(99)	(270)	(563)	(649)
Balance	0	0	0	0
Stock based compensation	120	242	314	718
Retained Earnings [Member]
Balance	103,391	137,127	129,130	140,009
Purchase and retirement of common stock	(27)	(2,487)	(332)	(3,798)
Balance	104,743	135,533	104,743	135,533
Cumulative effect of a change in accounting principal	0	0	(3,785)	(21)
Net income (loss) for the period	2,178	2,157	(16,964)	3,210
Cash dividends declared	(799)	(1,264)	(3,306)	(3,867)
AOCI Attributable to Parent [Member]
Balance	(1,187)	(2,223)	(1,236)	(2,338)
Balance	(1,162)	(2,165)	(1,162)	(2,165)
Amortization of pension costs, net of tax	$ 25	$ 58	$ 74	$ 173