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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement Line Items [Line Items]        
Cash generated by operations $ 5,413 $ 2,484 $ 16,371 $ 9,117
Net interest paid (123) 16 (263) (96)
Tax paid (1,315) (362) (2,034) (608)
Net cash from operating activities 3,975 2,138 14,074 8,413
Cash flows from investing activities        
Acquisition of property, plant and equipment (3,228) (4,186) (7,921) (9,326)
Purchase of derivate financial asset (1,058) (1,058)
Proceeds on disposal of subsidiary 900 1,000
Net cash used in investing activities (4,286) (4,186) (8,079) (8,326)
Cash flows from financing activities        
Dividends paid (1,012) (882) (1,981) (1,620)
Payment of lease liabilities (32) (57)
Proceeds from share option exercises 30 30
Net cash used in financing activities (1,014) (882) (2,008) (1,620)
Net (decrease)/ increase in cash and cash equivalents (1,325) (2,930) 3,987 (1,533)
Effect of exchange rate fluctuations on cash held (861) 1,063 (1,241) (1,779)
Net cash and cash equivalents at beginning of period 13,825 9,742 8,893 11,187
Net cash and cash equivalents at end of period $ 11,639 $ 7,875 $ 11,639 $ 7,875