(2) Bill and Hold (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended	24 Months Ended
	Jun. 30, 2013 T	Apr. 01, 2014 T	Apr. 01, 2014 T
Revenue Recognition, Bill and Hold Arrangements [Policy Text Block]
Tons of Coal Agreed to Store Per Customer			250,000
Change in Coal Held for Customers		50,000
Increase (Decrease) In Coal Inventories Mass	145,000
Revenue from Bill and Hold (in Dollars)	$ 7.3
Tons of Coal Stored for First Customer at Reporting Date	300,000
Tons of Coal Stored for Second Customer at Reporting Date	250,000