Annual report pursuant to Section 13 and 15(d)

Note 5 - Property and Equipment, Net (Details Textual)

v3.20.4
Note 5 - Property and Equipment, Net (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 29, 2019
USD ($)
Dec. 31, 2020
USD ($)
ft²
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Depreciation, Total           $ 1,900 $ 3,500
Impairment of Long-Lived Assets Held-for-use   $ 11,741 $ (0) $ (0) $ (0) $ 11,741 $ (0)
AquaRefining Fire [Member]              
Property, Plant and Equipment, Transfers and Changes $ 22,400            
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment 2,500            
Property, Plant and Equipment, Net Write-off $ 19,900            
Asset under Construction [Member]              
Area of Land (Square Foot) | ft²   136,750       136,750  
Construction in Progress Not Yet Capitalized [Member]              
Property, Plant and Equipment, Net Write-off           $ 7,700  
Property, Plant and Equipment, Other Types [Member]              
Property, Plant and Equipment, Net Write-off           $ 4,000