Note 6 - Accounting for Share-based Compensation - Deferred Compensation Units (Details)	6 Months Ended
	Jun. 01, 2019 shares
Units outstanding (in shares)	509,522
Participant contributions (in shares)	17,523
Company match contributions (in shares)	1,752
Payouts (in shares)	(4,507)
Units outstanding (in shares)	524,290
Non Employee Directors [Member]
Units outstanding (in shares)	479,787
Participant contributions (in shares)	10,874
Company match contributions (in shares)	1,087
Payouts (in shares)
Units outstanding (in shares)	491,748
Employees [Member]
Units outstanding (in shares)	29,735
Participant contributions (in shares)	6,649
Company match contributions (in shares)	665
Payouts (in shares)	(4,507)
Units outstanding (in shares)	32,542