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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities:      
Profit before tax $ 1,106 $ 11,332 $ 18,668
Adjustments to reconcile profit before tax to net cash provided by operating activities:      
Depreciation 5,274 4,936 4,972
Impairment of property, plant and equipment 546 11 223
Amortization of prepaid land lease payments   38 35
Amortization of intangible assets 50 44 49
Gain on disposal of property, plant and equipment (88) (93) (99)
Gain on disposal of assets classified as held for sale     (4,525)
Adjustment for loss (gain) on fair value of derivatives (146) 2 332
Dividend income (109) (105) (100)
Finance income (506) (482) (876)
Finance costs 1,012 1,378 1,221
Share of loss of associates 3 3 3
Impairment (reversal of impairment) for trade receivables (122) 570 302
Impairment for trade receivables for related parties   1 27
Impairment of other receivable 30 53  
Impairment (write-back of impairment) of inventories (322) 1,613 532
Unrealized foreign exchange difference, net (503) (742) (1,771)
Loss on liquidation of subsidiary     261
Changes in operating assets and liabilities      
Trade and other receivable, net 16,031 27,993 (17,438)
Contract assets (3,160) (1,317)  
Inventories 3,166 10,339 (11,523)
Prepayment and other current assets 484 133 123
Amounts due to/from related parties 1,177 (1,422) 2,733
Other non-current assets (238) (55) 77
Trade and other payables, accruals, other current liabilities and other non-current liabilities (5,527) (8,518) (6,778)
Net cash flows (used in) provided by operating activities 18,158 45,712 (13,552)
Dividend received 109 105 100
Interest received 457 405 858
Interest paid (894) (1,216) (1,043)
Income tax paid (2,690) (4,357) (2,787)
Net cash provided (used in) by operating activities 15,140 40,649 (16,424)
Investing activities:      
Purchases of property, plant and equipment (5,442) (4,441) (4,903)
Purchases of intangible assets (20) (67) (10)
Purchases of investment properties     (84)
Purchases of long-term bank deposits (272) (410) (475)
Purchases of short-term bank deposits (835)    
Proceeds from disposal of held for sale assets     8,011
Proceeds from disposal of property, plant and equipment 171 100 510
Proceeds from disposal of other financial assets-held to maturity     340
Net cash (used in) provided by investing activities (6,398) (4,818) 3,389
Financing activities:      
Dividend paid to non-controlling shareholders of subsidiaries (2,763) (2,206) (1,943)
Dividend paid to company's shareholders   (1,106) (1,382)
Repayments of borrowings (19,811) (25,737) (17,306)
Proceeds from borrowings 5,349 9,517 27,714
Change in financial lease liabilities   (46) (41)
Principal elements of lease payments (426)    
Effect from the changes in shareholding percentage in subsidiary (298)    
Net cash (used in) provided by financing activities (17,949) (19,578) 7,042
Effect of exchange rate 2,102 (1,568) 3,855
Net (decrease) increase in cash and cash equivalents (7,105) 14,685 (2,138)
Cash and cash equivalents at beginning of year 60,778 46,093 48,231
Cash and cash equivalents at end of year $ 53,673 $ 60,778 $ 46,093