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Note 9 - Stockholders' Equity (Details) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 25, 2013 $ / shares | Mar. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) shares | Feb. 19, 2016 $ / shares | Jun. 15, 2015 CAD / shares | Jun. 02, 2013 $ / shares | Jun. 02, 2013 CAD / shares | May. 08, 2012 USD ($) | Jun. 30, 2010 shares
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  | 500,000,000 | 500,000,000 |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares |  |  | $ 0.25 | $ 0.25 |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  | 378,112,840 | 367,376,863 |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |
Average Realized Silver Price (in Dollars) | $ |  |  |  | $ 30 | $ 30 |  |  |  |  |  |
Dividends, Common Stock (in Dollars) | $ |  | $ 3,600,000 | $ (3,739,000) | $ (3,546,000) | $ (6,062,000) |  |  |  |  |  |
Share Price (in Dollars per share) | (per share) |  |  |  |  |  |  | CAD 3.06 | $ 3.83 | CAD 3.97 |  |
Class of Warrant or Right, Outstanding |  |  | 2,249,550 |  | 22,307,623 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ / shares |  |  | $ 6.17 | $ 54,400,000 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 0.1622 |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares |  |  | $ 0.25 | $ 0.25 |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 157,816 | 157,816 |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value (in Dollars) | $ |  |  | $ 7,891,000 | $ 7,891,000 |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) | $ |  |  | $ 3,400,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 506,921 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 0 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars) | $ |  |  |  | $ 259,342 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share) | $ / shares |  |  |  | $ 5.47 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 0 | 0 | 0 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0 | 0 | 0 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 3,375,798 | 2,235,575 |  |  |  |  |  |  |
Stock Repurchased During Period, Value (in Dollars) | $ |  |  | $ (940,000) | $ (1,501,000) | $ (286,000) |  |  |  |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount (in Dollars) | $ |  |  |  |  |  |  |  |  |  | $ 20,000,000 |
Cumulative Stock Repurchased |  |  | 934,100 |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares |  |  | $ 3.99 |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars) | $ |  |  | $ 19,100,000 |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 157,816 |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in Dollars per share) | $ / shares |  |  | $ 3.50 |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in Dollars per share) | $ / shares |  |  | 50 |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) | $ / shares |  |  | $ 50 |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value (in Dollars) | $ |  |  | $ 7,900,000 |  |  |  |  |  |  |  |
Preferred Stock, Voting Rights |  |  | one |  |  |  |  |  |  |  |
Preferred Stock Conversion Price (in Dollars per share) | $ / shares |  |  | $ 15.55 |  |  |  |  |  |  |  |
Preferred Stock Conversion Rate |  |  | 3.2154% |  |  |  |  |  |  |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares |  |  | $ 3.06 |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  | 613,698 |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value (in Dollars) | $ |  |  | $ 1,900,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share Price (in Dollars per share) | $ / shares |  |  |  |  |  | $ 2.36 |  |  |  |  |
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  | $ 5,400,000 | 5,000,000 | 4,500,000 |  |  |  |  |  |
Restricted Stock Units Vesting in June 2016 [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 763,543 |  |  |  |  |  |  |  |
Restricted Stock Units Vesting in July 2016 [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 802,111 |  |  |  |  |  |  |  |
Restricted Stock Units Vesting in August 2016 [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 26,000 |  |  |  |  |  |  |  |
Restricted Stock Units Vesting in June 2017 [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 414,546 |  |  |  |  |  |  |  |
Restricted Stock Units Vesting in July 2017 [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 724,249 |  |  |  |  |  |  |  |
Restricted Stock Units Vesting in July 2018 [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 645,349 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  | $ 4,000,000 |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars) | $ |  |  | 4,900,000 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Expense Recognized Over Remaining Vesting Period [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  | $ 4,300,000 |  |  |  |  |  |  |  |
Two Thousand Ten Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  |  | $ 366,000 | $ 276,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  | 20,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 11,975,936 |  |  |  |  |  |  |  |
Two Thousand Ten Stock Incentive Plan [Member] | Non-employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  | $ 456,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  | 186,888 | 110,910 | 94,200 |  |  |  |  |  |
Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  | $ 150,000 | $ 109,000 | $ 111,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 1,000,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Method of Measuring Cost of Award Participant Numerator (in Dollars) | $ |  |  | $ 24,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  | 48,244 | 39,468 | 28,050 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Note 9 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ / shares | $ 0.0025 |  | $ 0.01 |  |  |  |  |  |  |  |
Average Realized Silver Price (in Dollars) | $ |  |  | $ 30 |  |  |  |  |  |  |  |

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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Description of voting rights of nonredeemable preferred stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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