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Note 8 - Shareholders' Equity (Details Textual) |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May. 04, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / oz shares | Mar. 31, 2016 USD ($) $ / shares $ / oz shares | Mar. 31, 2015 USD ($) $ / shares shares | May. 03, 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 | shares |  |  | 2,335,196 |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  | $ 5,500,000 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  | $ 1,200,000 | $ 1,100,000 |  |  |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation | shares |  |  | 532,157 | 284,243 |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation | $ |  |  | $ 1,300,000 | $ 900,000 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  | $ 2.36 | $ 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 |  |  |  |  |  |  |
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 | shares |  |  |  |  |  |  |  | 20,000,000
Cumulative Stock Repurchased | shares |  | 934,100 | 934,100 |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares |  | 19,100,000 | 19,100,000 |  |  |  |  |
Average Realized Silver Price | $ |  |  | $ 14.93 |  |  |  |  |
Average Realized Silver Price Minimum Dividend Threshold | $ / oz |  | 30 | 30 |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  | 737,275 |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  | $ 2,100,000 |  |  |  |  |  |
Payments for Brokerage Fees | $ |  | $ 42,000 |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  | $ 4.05 |  |  |
Class of Warrant or Right, Outstanding | shares |  | 0 | 0 |  |  |  | 2,249,550 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  |  | 0.1622 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  | $ 6.17 |

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- Definition The minimum average realized silver price per ounce that must be met for the silver-price-linked component of dividends to be declared. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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