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Administrative Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Selling, general and administrative expense [abstract]      
Personnel expenses $ 1,455 $ 1,013 $ 1,006
Audit fees 215 143 98
Consulting fees 329 243 191
Communication 16 12 7
Stationery 6 3 2
Greek tax authorities (note 19) 185 130 116
Other 404 347 163
Total $ 2,610 $ 1,891 $ 1,583