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Nature of operations and summary of significant accounting policies and going concern (Inventories) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Energy Related Inventory      
Equipment inventory $ 2,673 $ 2,673 $ 3,435
Commodities 425 425 474
Inventory valuation allowance (642) (642) (179)
Inventories, net 2,456 2,456 $ 3,730
Inventory impairment $ 310 $ 463