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Nature of operations and summary of significant accounting policies and going concern (Inventories) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Inventory impairment $ 153  
Energy Related Inventory    
Equipment inventory 2,730 $ 3,435
Commodities 444 474
Inventory valuation allowance (332) (179)
Inventories, net $ 2,842 $ 3,730