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Note 26 - Cash Flow Information - Non-cash Items and Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 23, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]        
Profit for the year   $ 11,896 $ 11,085 $ 5,590
Tax expense   8,691 7,717 2,370
Net finance cost   31 176 535
Loss on sale of Property, plant and equipment   2 44
Impairment of Property, plant and equipment   12 20 33
Foreign exchange gains on cash held   121 (105) (2,865)
Site restoration   36 32
Cash-settled share-based payment expense   1,208 788
Equity-settled share-based payment expense $ 806 835 170 24
Depreciation   3,763 3,491 3,322
Allowance for obsolete stock   32 862 46
Provision for impairment - royalty rebate (note 17)   181
Cash generated by operations before working capital changes   26,808 24,110 9,055
Inventories   (1,975) (1,990) 375
Prepayments   82 (99) (321)
Trade and other receivables   (1,437) 555 (1,472)
Trade and other payables   5,407 3,095 1,186
Cash flows from operating activities   $ 28,885 $ 25,671 $ 8,823