Note 14 - Employee Stock Option and Retirement Plans - Summary of Share-based Awards Available for Grant (Details) - shares		3 Months Ended
		May 31, 2017	Feb. 28, 2017		Nov. 30, 2016
The 2004 Stock Option and Award Plan [Member]
Balance (in shares)		788,000	814,000		1,491,000
Share-based awards canceled/forfeited (in shares)		58,000	56,000	[1]	29,000	[1]
Balance (in shares)		834,000	788,000		814,000
The 2004 Stock Option and Award Plan [Member] | Non Performance Based [Member]
Granted (in shares)		(12,000)			(671,000)
The 2004 Stock Option and Award Plan [Member] | Performance Shares [Member]
Granted (in shares)			(62,000)		(23,000)
The 2004 Stock Option and Award Plan [Member] | Restricted Stock [Member]
Granted (in shares)	[2]		(20,000)		(12,000)
Non Employee Directors Stock Option Plan [Member]
Balance (in shares)		42,000	66,000		66,000
Share-based awards canceled/forfeited (in shares)				[1]		[1]
Balance (in shares)		42,185	42,000		66,000
Non Employee Directors Stock Option Plan [Member] | Non Performance Based [Member]
Granted (in shares)			(24,000)
Non Employee Directors Stock Option Plan [Member] | Performance Shares [Member]
Granted (in shares)
Non Employee Directors Stock Option Plan [Member] | Restricted Stock [Member]
Granted (in shares)	[2]

[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.