Note 13 - Income Taxes (Detail) - Income Taxes (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Expected tax expense at 35%	$ 13,614	$ 14,519	$ 24,024	$ 30,414
Cellulosic biofuel credits			(9,420)	(51,624)
Loss on Americana investment			(6,567)
Energy investment tax credits	(1,070)	(794)	(2,724)	(2,462)
Change in valuation allowance	752	488	613	2,183
Other	(244)	(1,424)	1,200	(1,785)
Income tax (benefit) expense	$ 13,052	$ 12,789	$ 7,126	$ (23,274)