Note 13 - Employee Stock Option and Retirement Plans - Summary of Share-based Awards Available for Grant (Details) - shares			3 Months Ended
		Dec. 19, 2017	Feb. 28, 2018		Nov. 30, 2017
LTIP [Member]
Balance (in shares)			392,000		897,000
Share-based awards canceled/forfeited (in shares)	[1]		89,000		51,000
Increase in the number of shares available for issuance (in shares)		5,750,000	5,750,000	[2],[3]
Balance (in shares)			6,215,000		392,000
LTIP [Member] | Non Performance Based [Member]
Granted (in shares)					(554,000)
LTIP [Member] | Restricted Stock [Member]
Granted (in shares)	[4]				(2,000)
LTIP [Member] | Performance Shares [Member]
Granted (in shares)					(16,000)
Director Plan [Member]
Balance (in shares)			42,000		42,000
Share-based awards canceled/forfeited (in shares)	[1]
Increase in the number of shares available for issuance (in shares)		250,000	250,000	[2],[3]
Balance (in shares)			273,222		42,000
Director Plan [Member] | Non Performance Based [Member]
Granted (in shares)
Director Plan [Member] | Restricted Stock [Member]
Granted (in shares)	[4]
Director Plan [Member] | Performance Shares [Member]
Granted (in shares)					(19,000)

[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] On December 19, 2017, the Company's stockholders approved the Director Plan. As part of the approval, an additional 250,000 shares of commons stock were added to the Director Plan share reserve.

[3] On December 19, 2017, the Company's stockholders approved the LTIP. As part of the approval, an additional 5,750,000 shares of common stock were added to the LTIP’s share reserve.

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