v3.21.2
Income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Line Items]      
Withholding Income Tax Dividend Distribution 10.00%    
Other Income Tax Expense (Benefit), Continuing Operations $ 1,870,000 $ 691,000 $ 275,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
INCOME TAX BENEFIT $ (309) $ 410 $ 16
PRC Entities [Member]      
Income Tax Disclosure [Line Items]      
Undistributed Earnings, Basic 0 0  
Operating Loss Carryforwards $ 1,512 $ 1,509  
Enterprise Income Tax [Member]      
Income Tax Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 25.00%    
Scenario, Plan [Member]      
Income Tax Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Hong Kong [Member]      
Income Tax Disclosure [Line Items]      
INCOME TAX BENEFIT $ (741) $ (532) $ (146)
Hong Kong [Member] | SGOCO International      
Income Tax Disclosure [Line Items]      
Operating Loss Carryforwards $ 6,106 $ 5,747  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 16.50% 16.50% 16.50%
Hong Kong [Member] | First-tier rate      
Income Tax Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 8.25% 8.25%  
Hong Kong [Member] | Second-tier rate      
Income Tax Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 16.50% 16.50%  
Domestic Tax Authority [Member] | SGO      
Income Tax Disclosure [Line Items]      
Operating Loss Carryforwards   $ 609  
Domestic Tax Authority [Member] | SGOCO International      
Income Tax Disclosure [Line Items]      
INCOME TAX BENEFIT $ 0 $ 0 $ 0