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Note 12 - Sale of Blanket Mine Treasury Bills (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	May 16, 2016	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Statement Line Items [Line Items]
Net gains (losses) on disposals of investments	$ 3,202			[1]	$ 3,202
[1] Restated, refer note 4(a).

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No definition available.

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- Definition

The gains (losses) on disposals of investments.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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