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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Cash flows from operating activities $ 28,885 $ 25,671 $ 8,823
Interest received 38 16 1
Interest paid (199) (210) (493)
Tax paid (4,212) (2,466) (1,462)
Net cash from operating activities 24,512 23,011 6,869
Cash flows from investing activities      
Acquisition of property, plant and equipment (21,639) (19,885) (16,567)
Proceeds from sale of property, plant and equipment 3
Net cash used in investing activities (21,639) (19,882) (16,567)
Cash flows from financing activities      
Dividends paid (3,310) (2,994) (2,504)
Term loan repayments (1,500)
Term loan proceeds 3,000
Term loan transaction costs (73)
Proceeds from issue of share capital 246 433
Share repurchase cost (146)
Net cash (used in)/from financing activities (4,710) 366 (2,504)
Net (decrease)/increase in cash and cash equivalents (1,837) 3,495 (12,202)
Effect of exchange rate fluctuation on cash held 258 (40)
Net cash and cash equivalents at beginning of year 14,335 10,880 23,082
Net cash and cash equivalents at year end $ 12,756 $ 14,335 $ 10,880