Discontinued Operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Jan. 31, 2013
Discontinued operations
Income (loss) from discontinued operations, net of income taxes	$ (575,000)	$ 2,023,000	$ 125,000	$ 25,000
Coal cleaning business
Discontinued operations
Remaining assets held for sale					0
Revenue	0	137,000	0	4,386,000
Loss from operations of discontinued operations before income taxes	(2,728,000)	(1,087,000)	(2,992,000)	(3,085,000)
Gain on disposal	2,153,000	3,110,000	3,117,000	3,110,000
Income tax provision	0	0	0	0
Income (loss) from discontinued operations, net of income taxes	(575,000)	2,023,000	125,000	25,000
Maximum potential future consideration	50,000,000		50,000,000
Accrued contingent liability for reclamation obligations	8,000,000		8,000,000
Proceeds from deferred purchase price payments			$ 2,700,000