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Note 8 - Shareholders' Equity (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 15 Months Ended | 26 Months Ended |  |  |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2014 | Feb. 28, 2012 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | May 08, 2012 | Jun. 30, 2014 Series 3 Warrants [Member] | Jun. 25, 2014 Restricted Stock Units (RSUs) [Member] Recognized Over the Next 12 Months [Member] Vesting in June 2015 [Member] | Jun. 25, 2014 Restricted Stock Units (RSUs) [Member] Recognized Over the Next 24 Months [Member] Vesting in June 2016 [Member] | Jun. 25, 2014 Restricted Stock Units (RSUs) [Member] Recognized Over the Next 36 Months [Member] Vesting in June 2017 [Member] | Jun. 25, 2014 Restricted Stock Units (RSUs) [Member] Vesting: One Third in June 2015, One Third in June 2016, and One Third in June 2017 [Member] | Jun. 25, 2014 Restricted Stock Units (RSUs) [Member] Vesting: One Half in June 2015 and One Half in June 2016 [Member] | Jun. 25, 2014 Restricted Stock Units (RSUs) [Member] Vesting in June 2015 [Member] | Mar. 03, 2014 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2014 Silver Priced Linked Component [Member] | Jul. 30, 2014 Subsequent Event [Member] Coeur d'Alene Basin Environmental Litigation [Member] | Jul. 29, 2014 Subsequent Event [Member] | Jun. 30, 2014 Minimum [Member]
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,251,213 | 107,576 | 87,872 | 1,345,072 |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) |  |  |  |  |  | $ 2,600,000 | $ 1,900,000 |  |  |  |  |  | $ 3,100,000 | $ 1,700,000 | $ 1.7 |  |  |  |  | $ 4,600,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 150,378 |  |  |  |  | 122,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  |  |  | 533,800,000,000 |  |  | 934,100 |  |  |  |  |  |  |  |  |  |  |  | 11,090 |  |  |  |
Stock Repurchased During Period, Value (in Dollars) |  |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  |  |  | $ 3.57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) |  | $ 0.01 | $ 0.0025 |  | $ 0.0025 | $ 0.0050 | $ 0.0050 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0.0025 |
Dividends, Common Stock (in Dollars) | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Realized Silver Price (in Dollars) |  |  | 19.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30
Payments of Dividends (in Dollars) |  |  |  |  |  | 1,991,000 | 4,553,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  |  |  | 22,307,623 |  | 16,451,531 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Exercised, Shares |  |  |  |  |  | 5,856,092 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises (in Dollars) |  |  |  |  |  | 14,112,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 2.45 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Legal Settlements (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Final Price Paid Per Share (in Dollars per share) |  |  |  |  |  | $ 2.81 |  |  | $ 3.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  | 19,100,000 |  |  | 19,100,000 |  | 19,100,000 | 19,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in Dollars per share) | $ 3.26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + 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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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