Note 7 - Accounting for Share-based Compensation - Deferred Compensation Units (Details)	9 Months Ended
	Aug. 29, 2020 shares
Units outstanding (in shares)	562,324
Participant contributions (in shares)	51,637
Company match contributions (in shares)	5,164
Payouts (in shares)	(123,972)
Units outstanding (in shares)	495,153
Non Employee Directors [Member]
Units outstanding (in shares)	525,660
Participant contributions (in shares)	35,851
Company match contributions (in shares)	3,585
Payouts (in shares)	(111,436)
Units outstanding (in shares)	453,660
Employees [Member]
Units outstanding (in shares)	36,664
Participant contributions (in shares)	15,786
Company match contributions (in shares)	1,579
Payouts (in shares)	(12,536)
Units outstanding (in shares)	41,493