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Note 12 - Administrative Expense - Components of Administrative Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Investor relations $ 541 $ 543 $ 513
Audit fee 231 267 240
Advisory services fee 684 2,266 1,251
Listing fees 402 328 206
Directors fees company 247 211 191
Directors fees Blanket 40 48 60
Employee costs 2,781 2,803 3,106
Office costs - Zambia 17 716
Unrecoverable VAT expenses 298
Donation to community 58
Other office administration costs 444 185 547
Travel costs 399 484 325
Eersteling Gold Mine administration costs 142 111 111
Total $ 5,911 $ 7,263 $ 7,622