Average realized silver price.

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The minimum average realized silver price per ounce that must be met for the silver-price-linked component of dividends to be declared.

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No definition available.

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Represents the common stock aggregate offering price.

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Cumulative stockrepurchased

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Number of warrants or rights outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of cash paid for brokerage fees during the current period. This element is intended to represent the brokerage fees paid by and between financial industry participants.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of share instruments newly issued under a share-based compensation plan.

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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Number of new stock issued during the period.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Note 8 - Shareholders' Equity (Details Textual)		1 Months Ended		3 Months Ended		4 Months Ended	6 Months Ended
Note 8 - Shareholders' Equity (Details Textual)	Aug. 03, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / oz shares	Mar. 31, 2016 USD ($) shares	Jun. 30, 2016 USD ($) $ / shares $ / oz shares	Jun. 30, 2015 $ / shares shares	Jun. 30, 2016 USD ($) $ / oz shares	Jun. 30, 2016 USD ($) $ / shares $ / oz shares	Jun. 30, 2015 USD ($) $ / shares shares	Aug. 02, 2016 $ / shares	May 20, 2016 $ / shares	Feb. 23, 2016 USD ($)	Dec. 31, 2015 $ / shares shares	May 08, 2012 shares
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			2,335,196
Allocated Share-based Compensation Expense \| $			$ 5,500,000
RSUs Vesting in 2019 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.33%
RSUs Vesting in 2019 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.33%
RSUs Vesting in 2019 [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.33%
RSUs Vesting in 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		952,612
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized \| $		$ 1,400,000		$ 1,400,000		$ 1,400,000	$ 1,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		3 years
RSUs Vesting in 2018 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
RSUs Vesting in 2018 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
RSUs Vesting in 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		87,493
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized \| $		$ 1,600,000		1,600,000		1,600,000	1,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years
RSUs Vesting in 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		43,187
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized \| $		$ 1,800,000		$ 1,800,000		$ 1,800,000	1,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period				185,353	48,246
Employees and Non-employee Directors [Member]
Allocated Share-based Compensation Expense \| $							$ 3,500,000	$ 2,300,000
Satisfy Withholding Obligations [Member]
Shares Paid for Tax Withholding for Share Based Compensation							997,678	284,243
Payments Related to Tax Withholding for Share-based Compensation \| $							$ 3,400,000	$ 900,000
Treasury Stock Acquired, Average Cost Per Share \| $ / shares							$ 3.40	$ 3.31
Minimum [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares							0.01
Maximum [Member]
Common Stock, Aggregate Offering Price \| $											$ 75,000,000
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.0025
Dividends, Common Stock \| $	$ 1,000,000
Share Price \| $ / shares									$ 6.55
Common Stock Repurchase Program [Member]
Treasury Stock Acquired, Average Cost Per Share \| $ / shares							$ 3.99
Stock Repurchase Program, Number of Shares Authorized to be Repurchased													20,000,000
Cumulative Stock Repurchased		934,100		934,100		934,100	934,100
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		19,100,000		19,100,000		19,100,000	19,100,000
Common Stock, Dividends, Per Share, Declared \| $ / shares				$ 0.0025	$ 0.0025		$ 0.005	$ 0.005
Average Realized Silver Price \| $				$ 17.26
Average Realized Silver Price Minimum Dividend Threshold \| $ / oz		30		30		30	30
Stock Issued During Period, Shares, New Issues				2,042,812		2,780,087
Stock Issued During Period, Value, New Issues \| $				$ 6,100,000		$ 8,100,000
Payments for Brokerage Fees \| $				$ 124,000		$ 166,000
Share Price \| $ / shares									$ 0	$ 4.24
Class of Warrant or Right, Outstanding		0		0		0	0					2,249,550
Class of Warrant or Right, Number of Securities Called by Warrants or Rights												0.1622
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares												$ 6.17