Note 14 - Changes to Stockholders' Equity - Changes Occurred in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 27, 2021	Feb. 29, 2020
Balance	$ 158,030
Balance	157,701
Net income for the period	4,011	$ 1,210
Common Stock [Member]
Balance	49,714	50,581
Issuance of common stock	31	29
Forfeited shares	0	(35)
Purchase and retirement of common stock	(178)	(402)
Balance	$ 49,567	$ 50,173
Balance, shares (in shares)	9,942,787	10,116,291
Issuance of common stock, shares (in shares)	6,221	5,743
Forfeited shares (in shares)	0	(7,000)
Purchase and retirement of common stock, shares (in shares)	(35,512)	(80,443)
Balance, shares (in shares)	9,913,496	10,034,591
Paid in Capital [Member]
Balance	$ 0	$ 195
Issuance of common stock	52	46
Forfeited shares	0	35
Purchase and retirement of common stock	(66)	(361)
Balance	0	0
Stock based compensation	14	85
Retained Earnings [Member]
Balance	109,710	129,130
Purchase and retirement of common stock	(509)	(217)
Balance	109,493	125,078
Cumulative effect of a change in accounting principal	0	(3,785)
Net income for the period	4,011	1,210
Cash dividends declared	(3,719)	(1,260)
AOCI Attributable to Parent [Member]
Balance	(1,394)	(1,236)
Balance	(1,359)	(1,211)
Amortization of pension costs, net of tax	$ 35	$ 25