Note 1 - Nature of Business and Basis of Presentation (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	6 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013	May 31, 2013	Feb. 28, 2014 Annual [Member] Service Life [Member]	Feb. 28, 2014 Annual [Member] Service Life [Member]	Feb. 28, 2014 Uncollectible Receivables [Member]	Feb. 28, 2014 Service Life [Member]	Feb. 28, 2014 Service Life [Member]	Feb. 28, 2014 Minimum [Member]	Feb. 28, 2014 Maximum [Member]
Note 1 - Nature of Business and Basis of Presentation (Details) [Line Items]
Allowance for Doubtful Accounts Receivable, Recoveries								$ 1,900,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(7,355,000)	(5,913,000)	(15,902,000)	(26,947,000)			3,600,000	1,100,000	900,000	2,700,000
Property, Plant and Equipment, Useful Life			10 years		5 years						5 years	10 years
Depreciation	$ 4,500,000	$ 5,300,000	$ 13,200,000	$ 15,400,000		$ (6,300,000)	$ (6,300,000)		$ (1,600,000)	$ (4,700,000)