Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant	3 Months Ended																													0 Months Ended		9 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Feb. 28, 2014 Employee Option Plan [Member] Restricted Stock [Member]		Nov. 30, 2013 Employee Option Plan [Member] Restricted Stock [Member]		Nov. 30, 2013 Employee Option Plan [Member] Non-Employee Director Grant [Member]	Feb. 28, 2014 Employee Option Plan [Member] Performance Based [Member]	Nov. 30, 2013 Employee Option Plan [Member] Performance Based [Member]	Feb. 28, 2014 Employee Option Plan [Member] Non-Performance Based [Member]	May 31, 2014 Employee Option Plan [Member]	Feb. 28, 2014 Employee Option Plan [Member]		Nov. 30, 2013 Employee Option Plan [Member]		Feb. 28, 2014 Non-Employee Stock Option Plan [Member] Restricted Stock [Member]		Nov. 30, 2013 Non-Employee Stock Option Plan [Member] Restricted Stock [Member]		Nov. 30, 2013 Non-Employee Stock Option Plan [Member] Non-Employee Director Grant [Member]	Feb. 28, 2014 Non-Employee Stock Option Plan [Member] Performance Based [Member]	Nov. 30, 2013 Non-Employee Stock Option Plan [Member] Performance Based [Member]	Feb. 28, 2014 Non-Employee Stock Option Plan [Member] Non-Performance Based [Member]	May 31, 2014 Non-Employee Stock Option Plan [Member]	Feb. 28, 2014 Non-Employee Stock Option Plan [Member]		Nov. 30, 2013 Non-Employee Stock Option Plan [Member]		Nov. 02, 2013 Restricted Stock [Member]	Apr. 14, 2011 Restricted Stock [Member]	May 31, 2014 Restricted Stock [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]
Balance												2,280,000	2,656,000		3,116,000										102,000	107,000		107,000
Granted								(36,000)	(166,000)	(36,000)	(139,000)										0	0	0	(14,000)
Granted		(42,000)	(162,000)	(106,000)	[1]	(404,000)	[1]										0	[1]	0	[1]										(153,972)	(29,087)	(12,264)
Share-based awards canceled/forfeited	16,000	24,000	10,000									21,000	35,000	[1]	16,000	[1]									0	9,000	[1]	0	[1]
Balance												2,301,000	2,280,000		2,656,000										102,000	102,000		107,000

[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.