Note 7 - Alternative Fuel Mixture Credits/Cellulosic Biofuel Credits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended			12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013	Jun. 30, 2016 Scenario, Forecast [Member]	Jun. 30, 2013 Cellulosic Biofuel Credit [Member]	Jun. 30, 2012 Cellulosic Biofuel Credit [Member]	Jun. 30, 2011 Cellulosic Biofuel Credit [Member]	Jun. 30, 2011 Alternative fuel mixture credit conversion to cellulosic biofuel credits [Member]	Jun. 30, 2012 Alternative fuel mixture credit conversion to cellulosic biofuel credits [Member]
Note 7 - Alternative Fuel Mixture Credits/Cellulosic Biofuel Credits (Details) [Line Items]
Alternative Fuel Mixture Credit Per Gallon	0.50
Other Tax Expense (Benefit)					$ (4,586)	$ (9,040)	$ 20,327	$ (31,131)
Tax Credit Carryforward, Amount				11,521			56,278
Interest Expense	8,093	1,521
Accrued Income Taxes	5,798		3,561		49,352				61,661
Taxes Payable, Current	11,920		0
Accrued Income Taxes, Noncurrent	49,741		49,352
Deferred Tax Assets, Gross	$ 121,746		$ 115,447			$ 2,928