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Note 9 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels [Table Text Block]

Quarterly average realized silver price per ounce				Quarterly dividend per share				Annual dividend per share
	$30				$0.01				$0.04
	$35				$0.02				$0.08
	$40				$0.03				$0.12
	$45				$0.04				$0.16
	$50				$0.05				$0.20
	$55				$0.06				$0.24
	$60				$0.07				$0.28

Schedule of Dividends Payable [Table Text Block]

		(A)				(B)				(A+B)
Declaration date		Silver-price- linked component per share				Minimum annual component per share				Total dividend per share				Total dividend amount (in millions)			Month of payment
February 17, 2015			$—				$0.0025				$0.0025				$0.9		March 2015
May 6, 2015			$—				$0.0025				$0.0025				$0.9		June 2015
August 6, 2015			$—				$0.0025				$0.0025				$0.9		September 2015
November 3, 2015			$—				$0.0025				$0.0025				$0.9		December 2015
February 20, 2016			$—				$0.0025				$0.0025				$0.9		March 2016
May 4, 2016			$—				$0.0025				$0.0025				$1.0		June 2016
August 3, 2016			$—				$0.0025				$0.0025				$1.0		September 2016
November 4, 2016			$—				$0.0025				$0.0025				$1.0		December 2016
February 21, 2017			$—				$0.0025				$0.0025				$1.0		March 2017
May 4, 2017			$—				$0.0025				$0.0025				$1.0		June 2017
August 3, 2017			$—				$0.0025				$0.0025				$1.0		September 2017
November 7, 2017			$—				$0.0025				$0.0025				$1.0		December 2017
February 14, 2018			$—				$0.0025				$0.0025				$1.0		March 2018

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

		Shares				Weighted Average Grant Date Fair Value per Share
Unvested, January 1, 2017			2,735,564			$	3.41
Granted (unvested)			884,406			$	5.87
Canceled			(78,176	)		$	3.10
Distributed (vested)			(1,446,476	)		$	3.26
Unvested, December 31, 2017			2,095,318			$	4.52

Schedule of Share-based Compensation, Unvested Shares Expected to Vest [Table Text Block]

669,756		in June 2018
549,041		in July 2018
622,036		in June 2019
254,485		in June 2020

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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