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Note 29 - Cash Flow Information - Non-cash Items and Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Operating profit $ 21,421 $ 20,618 $ 18,978
Loss on sale of Property, plant and equipment 2 44
Impairment of Property, plant and equipment 208 12 20
Foreign exchange (gains)/losses (243) 121 (105)
Cash-settled share-based payment expense 228 897 788
Cash-settled share-based payment expense included in operating cost 43 311
Equity-settled share-based payment expense 14 835
Site restoration 30 36 32
Depreciation 4,071 3,763 3,491
Allowance for obsolete stock 15 32 862
Provision for impairment – royalty rebate (note 11) 181
Net cash used for assets and liabilities held for sale (2)
Cash generated by operations before working capital changes 25,785 26,808 24,110
Inventories (277) (1,975) (1,990)
Prepayments (62) 82 (99)
Trade and other receivables (1,916) (1,437) 555
Trade and other payables (2,411) 5,407 3,095
Cash flows from operating activities $ 21,119 $ 28,885 $ 25,671