Segment Information (Details - intangible assets, long-term investment) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 70,185	$ 70,626
AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	325	398
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	45,818	46,307
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	532	586
ITALY
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	1,461	1,508
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	8,243	7,945
GREECE
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 13,806	$ 13,882