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Note 8 - Production Costs - Components of Production Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Salaries and wages $ 13,440 $ 12,206 $ 11,908
Expense from cash-settled share-based payment transactions included in production costs 311
Consumable materials 18,617 16,291 14,479
Site restoration 58 32
Pre-feasibility exploration cost 410 408 380
Safety 323 221 551
On mine administration 3,004 2,898 2,701
Other production cost 17 30
Total $ 36,180 $ 32,086 $ 30,019