Quarterly report pursuant to Section 13 or 15(d)

Note 7 - East Tennessee Materials and Energy Corporation ("M&EC") (Details Textual)

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Note 7 - East Tennessee Materials and Energy Corporation ("M&EC") (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Revenue, Net $ 12,715,000 $ 14,809,000 $ 25,422,000 $ 24,847,000  
M&EC [Member]          
Asset Retirement Obligation, Current 2,745,000   2,745,000    
Asset Retirement Obligations, Noncurrent         $ 881,000
Revenue, Net $ 1,692,000 $ 1,382,000 $ 5,072,000 $ 2,755,000