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Note 11 - Sale of Blanket Mine Treasury Bills (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	May 16, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Line Items [Line Items]
Net gains (losses) on disposals of investments	$ 3,202		$ 3,202

X

- References

No definition available.

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X

- Definition

The gains (losses) on disposals of investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2017-03-09

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