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28. Segment information (Details - Long-lived assets) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 50,428 $ 39,970
GREECE    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 18,121 2,637
UNITED STATES    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 16,556 16,368
ITALY    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 2,950 9,038
JAPAN    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 2 0
UNITED KINGDOM    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 9,657 9,642
CANADA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 1,190 2,285
AUSTRALIA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 1,952 $ 0