Nature of operations and summary of significant accounting policies and going concern (Assets Held for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long Lived Assets Held-for-sale [Line Items]
Held for sale assets	$ 111	$ 2,860
Equipment
Long Lived Assets Held-for-sale [Line Items]
Held for sale assets	0	1,572
Vehicles
Long Lived Assets Held-for-sale [Line Items]
Held for sale assets	111	488
Real estate
Long Lived Assets Held-for-sale [Line Items]
Held for sale assets	$ 0	$ 800