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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Cash flows from operating activities $ 21,119 $ 28,885 $ 25,671
Interest received 53 38 16
Interest paid (161) (199) (210)
Tax paid (3,344) (4,212) (2,466)
Net cash from operating activities 17,667 24,512 23,011
Cash flows from investing activities      
Acquisition of property, plant and equipment (20,192) (21,639) (19,885)
Proceeds from sale of property, plant and equipment 3
Net cash used in investing activities (20,192) (21,639) (19,882)
Cash flows from financing activities      
Dividends paid (3,497) (3,310) (2,994)
Term loan repayments (1,500) (1,500)
Term loan proceeds 6,000 3,000
Term loan transaction costs (60) (73)
Proceeds from issue of share capital 246 433
Share repurchase cost (146)
Net cash from/(used in) financing activities 943 (4,710) 366
Net (decrease)/increase in cash and cash equivalents (1,582) (1,837) 3,495
Effect of exchange rate fluctuation on cash held 13 258 (40)
Cash and cash equivalents at beginning of year 12,756 14,335 10,880
Net cash and cash equivalents at year end $ 11,187 $ 12,756 $ 14,335