Note 7 - Accounting for Share-Based Compensation - Deferred Compensation Units (Details)	3 Months Ended
	Feb. 29, 2020 shares
Units outstanding (in shares)	562,324
Participant contributions (in shares)	8,956
Company match contributions (in shares)	896
Payouts (in shares)	(5,710)
Units outstanding (in shares)	566,466
Non Employee Directors [Member]
Units outstanding (in shares)	525,660
Participant contributions (in shares)	5,901
Company match contributions (in shares)	590
Payouts (in shares)	0
Units outstanding (in shares)	532,151
Employees [Member]
Units outstanding (in shares)	36,664
Participant contributions (in shares)	3,055
Company match contributions (in shares)	306
Payouts (in shares)	(5,710)
Units outstanding (in shares)	34,315