Note 13 - Employee Stock Option and Retirement Plans - Summary of Share-based Awards Available for Grant (Details) - shares		3 Months Ended
		Feb. 28, 2019	Nov. 30, 2018
LTIP [Member]
Balance (in shares)		5,765,000	6,298,000
Share-based awards canceled/forfeited (in shares)	[1]	65,000	25,000
Balance (in shares)		5,824,000	5,765,000
LTIP [Member] | Non Performance Based [Member]
Granted (in shares)			(455,000)
LTIP [Member] | Restricted Stock [Member]
Granted (in shares)	[2]		(103,000)
LTIP [Member] | Performance Shares [Member]
Granted (in shares)		(6,000)
Director Plan [Member]
Balance (in shares)		282,000	282,000
Share-based awards canceled/forfeited (in shares)	[1]	3,000
Balance (in shares)		263,956	282,000
Director Plan [Member] | Non Performance Based [Member]
Granted (in shares)
Director Plan [Member] | Restricted Stock [Member]
Granted (in shares)	[2]
Director Plan [Member] | Performance Shares [Member]
Granted (in shares)		(21,000)

[1] Under the Company's Option Plan, for each restricted stock award canceled/forfeited, an equivalent of 2.5 shares is added back to the available share-based awards balance.

[2] Each restricted stock award granted is equivalent to 2.5 shares granted under the Company's Option Plan.