Note 15 - Changes to Stockholders' Equity - Changes Occurred in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2020	Mar. 02, 2019
Balance	$ 178,670
Net income for the period	1,210	$ 608
Balance	174,040
Common Stock [Member]
Balance	50,581	52,638
Issuance of common stock	29	217
Forfeited shares	(35)	0
Purchase and retirement of common stock	$ (402)	$ (257)
Balance, shares (in shares)	10,116,291	10,527,636
Issuance of common stock, shares (in shares)	5,743	43,472
Forfeited shares (in shares)	(7,000)	0
Purchase and retirement of common stock, shares (in shares)	(80,443)	(51,468)
Balance, shares (in shares)	10,034,591	10,519,640
Balance	$ 50,173	$ 52,598
Paid in Capital [Member]
Balance	195	0
Issuance of common stock	46	(118)
Forfeited shares	35	0
Purchase and retirement of common stock	(361)	(137)
Stock based compensation	85	255
Balance	0	0
Retained Earnings [Member]
Balance	129,130	140,009
Purchase and retirement of common stock	(217)	(608)
Cumulative effect of a change in accounting principal	(3,785)	(21)
Net income for the period	1,210	608
Cash dividends	(1,260)	(1,291)
Balance	125,078	138,697
AOCI Attributable to Parent [Member]
Balance	(1,236)	(2,338)
Amortization of pension costs, net of tax	25	58
Balance	$ (1,211)	$ (2,280)