Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Restricted Stock Award - Restricted Stock [Member] - shares	3 Months Ended			6 Months Ended	9 Months Ended
	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Feb. 28, 2015	May. 31, 2015	May. 31, 2014
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Restricted Stock Award [Line Items]
Balance	357,000	324,000	368,000	368,000	368,000
Granted (restricted stock and stock units)	38,000	1,000	10,000		49,158	204,124
Vested	(15,000)		(53,000)		(68,178)	(135,205)
Canceled/forfeited	(4,000)	(5,000)	(1,000)
Balance	339,000	357,000	324,000	357,000	339,000