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Note 10 - Stockholders' Equity (Details Textual) |  | 12 Months Ended | 34 Months Ended | 80 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 20, 2018 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares $ / item shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares $ / item shares | Dec. 31, 2018 USD ($) $ / shares $ / item shares | Feb. 19, 2019 $ / shares | Feb. 23, 2016 USD ($) | May 08, 2012 shares | Jun. 30, 2010 shares
Common Stock, Shares Authorized |  | 750,000,000 | 750,000,000 |  | 750,000,000 | 750,000,000 |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.25 | $ 0.25 |  | $ 0.25 | $ 0.25 |  |  |  |
Common Stock, Shares, Issued, Total |  | 482,603,937 | 399,176,425 |  | 482,603,937 | 482,603,937 |  |  |  |
Treasury Stock, Shares, Ending Balance |  | 5,226,791 | 4,529,450 |  | 5,226,791 | 5,226,791 |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance |  | 482,603,937 | 399,176,425 |  | 482,603,937 | 482,603,937 |  |  |  |
Average Realized Silver Price, Minimum Dividend, Threshold | $ / item |  | 30 |  |  | 30 | 30 |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 2,564,767 |  |  | 7,173,614 |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  | $ 6,746,000 | $ 9,611,000 | $ 8,121,000 | $ 24,500,000 |  |  |  |  |
Payments for Brokerage Fees | $ |  | $ 100,000 |  |  | $ 600,000 |  |  |  |  |
Preferred Stock, Shares Authorized |  | 5,000,000 | 5,000,000 |  | 5,000,000 | 5,000,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.25 | $ 0.25 |  | $ 0.25 | $ 0.25 |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance |  | 157,816 | 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% | 66.67% |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ |  | $ 7,891,000 | $ 7,891,000 |  | $ 7,891,000 | $ 7,891,000 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total | $ |  | $ 4,500,000 |  |  | $ 4,500,000 | $ 4,500,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  | 2,689,468 | 2,095,318 |  | 2,689,468 | 2,689,468 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards |  | 3 years |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  | 0 | 0 | 0 | 0 | 0 |  |  |  |
Klondex Mines Ltd [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 75,276,176 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 8.02 |  |  |  |  |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period | 4,136,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | 1 |  |  |  |  |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding | 2,068,000 |  |  |  |  |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring February 2029 [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding | 2,068,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 1.57 |  |  |  |  |  |  |  |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  | $ 3.86 | $ 4.88 |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  | 697,341 | 588,240 |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ |  | $ 2,700,000 | $ 2,900,000 |  |  |  |  |  |  |
2010 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  |  |  | $ 532,000 |  |  |  |  |  |
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 |  | 3,267,759 |  |  | 3,267,759 | 3,267,759 |  |  |  |
2010 Stock Incentive Plan [Member] | Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  |  | 120,911 |  |  |  |  |  |
Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  | $ 593,000 | $ 774,000 | $ 271,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 3,120,707 |  |  | 3,120,707 | 3,120,707 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Method of Measuring Cost of Award Participant, Numerator | $ |  | $ 120,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  | 161,630 | 156,122 | 68,462 |  |  |  |  |  |
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  | $ 6,300,000 | $ 6,300,000 | $ 6,200,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  | 3,800,000 |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ |  | 5,900,000 |  |  | $ 5,900,000 | $ 5,900,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Expense Recognized Over Remaining Vesting Period [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  | 5,200,000 |  |  |  |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  | 400,000 | 500,000 |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ |  | $ 900,000 |  |  | $ 900,000 | $ 900,000 |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares |  | $ 3.50 |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  | 50 |  |  | $ 50 | $ 50 |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares |  | $ 50 |  |  | $ 50 | $ 50 |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ |  | $ 7,900,000 | $ 7,900,000 |  | $ 7,900,000 | $ 7,900,000 |  |  |  |
Preferred Stock, Voting Rights |  | 1 |  |  |  |  |  |  |  |
Preferred Stock Conversion Price | $ / shares |  | $ 15.55 |  |  | $ 15.55 | $ 15.55 |  |  |  |
Preferred Stock Conversion Rate | $ / shares |  | $ 3.2154 |  |  | $ 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 | 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 | 19,100,000 |  |  |  |
Common Stock Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  | $ 2.92 |  |  |
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 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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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