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Note 9 - Shareholders' Equity (Details Textual) | 10 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) $ / shares $ / oz shares | Dec. 31, 2016 USD ($) $ / shares $ / oz shares | Dec. 31, 2015 USD ($) $ / shares $ / item shares | Dec. 31, 2014 USD ($) $ / item shares | Feb. 20, 2017 $ / shares | Feb. 23, 2016 USD ($) | May 08, 2012 shares | Jun. 30, 2010 shares
Common Stock, Shares Authorized | 500,000,000 | 500,000,000 | 500,000,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |  |
Common Stock, Shares, Issued | 395,286,875 | 395,286,875 | 378,112,840 |  |  |  |  |
Average Realized Silver Price Minimum Dividend Threshold | 30 | 30 | 30 | 30 |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,780,087 |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ | $ 8,100,000 | $ 8,121,000 |  |  |  |  |  |
Payments for Brokerage Fees | $ | $ 166,000 |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  | 2,249,550 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  | 0.1622 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  | $ 6.17 |  |  |  |  |
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000 | 5,000,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |  |
Preferred Stock, Shares Outstanding | 157,816 | 157,816 | 157,816 | 157,816 |  |  |  |
Percent of Shareholders' Consent Needed to Create or Issue Stock Ranking Senior to Series B Preferred Stock | $ | $ 66.67 | $ 66.67 |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ | 7,891,000 | 7,891,000 | $ 7,891,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ | $ 3,200,000 | $ 3,200,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 2,735,564 | 2,735,564 | 3,375,798 |  |  |  |  |
Stock Repurchased During Period, Value | $ |  |  | $ 940,000 | $ 1,501,000 |  |  |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  | $ 3.44 | $ 3.05 |  |  |  |  |
Stock Repurchased During Period, Shares |  | 1,010,509 | 613,698 |  |  |  |  |
Stock Repurchased During Period, Value | $ |  | $ 3,500,000 | $ 1,900,000 |  |  |  |  |
2010 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  | $ 532,000 | $ 456,000 | $ 366,000 |  |  |  |
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 | 8,302,326 | 8,302,326 |  |  |  |  |  |
2010 Stock Incentive Plan [Member] | Non-Employee Directors [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  | 120,911 | 186,888 | 110,910 |  |  |  |
Directors Stock Plan [Member] |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  | $ 271,000 | $ 150,000 | $ 109,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 1,000,000 | 1,000,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 438,459 | 438,459 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Method of Measuring Cost of Award Participant, Numerator | $ |  | $ 24,000 |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  | 68,462 | 48,244 | 39,468 |  |  |  |
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  | $ 6,200,000 | $ 5,400,000 | $ 5,000,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  | 3,600,000 |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ | $ 4,500,000 | 4,500,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Expense Recognized Over Remaining Vesting Period [Member] |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  | $ 4,800,000 |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares |  | $ 3.50 |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares | $ 50 | 50 |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares | $ 50 | $ 50 |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ | $ 7,900,000 | $ 7,900,000 |  |  |  |  |  |
Preferred Stock, Voting Rights |  | 1 |  |  |  |  |  |
Preferred Stock Conversion Price | $ / shares | $ 15.55 | $ 15.55 |  |  |  |  |  |
Preferred Stock Conversion Rate | $ / shares | $ 3.2154 | $ 3.2154 |  |  |  |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  | 20,000,000 |
Cumulative Stock Repurchased | 934,100 | 934,100 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  | $ 3.99 |  |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 19,100,000 | 19,100,000 |  |  |  |  |  |
Common Stock Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  | $ 6.58 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  | $ 0.01 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Common Stock, Aggregate Offering Price | $ |  |  |  |  |  | $ 75,000,000 |  |

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- Definition The percentage of shareholders who must give consent before any class or series of stock is created or issued that ranks senior to the Series B preferred stock as to dividends or amounts due upon liquidation, dissolution or winding up. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + 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 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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 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. + 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 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 3: 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 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: 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 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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