Note 13 - Employee Stock Option and Retirement Plans - Summary of Share-based Awards Available for Grant (Details) - shares		3 Months Ended
		May 31, 2019	Feb. 28, 2019	Nov. 30, 2018
LTIP [Member]
Balance (in shares)		5,824,000	5,765,000	6,298,000
Share-based awards canceled/forfeited (in shares)	[1]	80,000	65,000	25,000
Balance (in shares)		5,901,000	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]	(1,000)		(103,000)
LTIP [Member] | Performance Shares [Member]
Granted (in shares)		(2,000)	(6,000)
Director Plan [Member]
Balance (in shares)		264,000	282,000	282,000
Share-based awards canceled/forfeited (in shares)	[1]		3,000
Balance (in shares)		263,956	264,000	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.