Note 18 - Income Taxes (Details) - Income Tax Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Income Tax Reconciliation [Abstract]
Expected tax expense	$ 44,421	$ 57,374	$ 42,200
Expected tax expense	35.00%	35.00%	35.00%
Investment tax credit		(3,650)	(3,888)
Investment tax credit		(2.20%)	(3.20%)
Domestic manufacturing deduction	(4,346)	(4,880)	(4,530)
Domestic manufacturing deduction	(3.40%)	(3.00%)	(3.80%)
Effect of foreign operations	285	(32)	1,853
Effect of foreign operations	0.20%		1.50%
Nondeductible goodwill impairment charge		849
Nondeductible goodwill impairment charge		0.50%
Cellulosic biofuel credit	(4,586)	(9,040)	(51,458)
Cellulosic biofuel credit	(3.60%)	(5.50%)	(42.70%)
Change in valuation allowances	1,293	126	4,200
Change in valuation allowances	1.00%	0.10%	3.50%
State taxes and other, net	2,540	4,264	3,390
State taxes and other, net	2.00%	2.60%	2.90%
Income tax expense (benefit)	$ 39,607	$ 45,011	$ (8,233)
Income tax expense (benefit)	31.20%	27.50%	(6.80%)