Quarterly report pursuant to Section 13 or 15(d)

Note 8 - East Tennessee Materials and Energy Corporation ("M&EC") (Details Textual)

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Note 8 - East Tennessee Materials and Energy Corporation ("M&EC") (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Revenue, Net $ 12,707,000 $ 10,038,000  
M&EC [Member]      
Asset Retirement Obligation, Current 2,906,000    
Asset Retirement Obligations, Noncurrent     $ 881,000
Revenue, Net $ 3,379,000 $ 1,377,000