Note 13 - Summary of Stock Option Activity (Details) - $ / shares	3 Months Ended
	Feb. 29, 2016	Nov. 30, 2015
Non Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	4,073	513,785
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 150.81	$ 175.20
Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	23,000	530,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 146.82	$ 165.37
Balance (in shares)	3,876,000	3,117,000
Balance (in dollars per share)	$ 122.06	$ 100.71
Exercised (in shares)	(70,000)	(277,000)
Exercised (in dollars per share)	$ 63.77	$ 63.72
Forfeited (in shares)	(45,000)	(8,000)
Forfeited (in dollars per share)	$ 127.82	$ 108.32
Balance (in shares)	3,788,000	3,876,000
Balance (in dollars per share)	$ 123.24	$ 122.06