Note 7 - Accounting for Share-Based Compensation - Deferred Compensation Units (Details)	6 Months Ended
	May 30, 2020 shares
Units outstanding (in shares)	562,324
Participant contributions (in shares)	24,641
Company match contributions (in shares)	2,464
Payouts (in shares)	(122,648)
Units outstanding (in shares)	466,781
Non Employee Directors [Member]
Units outstanding (in shares)	525,660
Participant contributions (in shares)	11,753
Company match contributions (in shares)	1,175
Payouts (in shares)	(110,778)
Units outstanding (in shares)	427,810
Employees [Member]
Units outstanding (in shares)	36,664
Participant contributions (in shares)	12,888
Company match contributions (in shares)	1,289
Payouts (in shares)	(11,870)
Units outstanding (in shares)	38,971