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Note 8 - Stockholders' Equity (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 21, 2020 | Mar. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | May 05, 2020 | May 08, 2012
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.0025 |  | $ 0.0025 |  | $ 0.0025 |  |
Dividends, Common Stock, Total | $ 1,300,000 |  | $ 1,304,000 |  | $ 1,209,000 |  |
Average Realized Silver Price Per Ounce |  |  |  | $ 17.47 |  |  |
Average Realized Silver Price, Minimum Dividend, Threshold (in dollars per share) |  |  |  | $ 30 |  |  |
Klondex Mines Ltd [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 8.02 | $ 8.02 |  |  |  |
Warrants in Connection with Klondex Mines Acquisition [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  | 4,136,000 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 | 1 |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 2,068,000 | 2,068,000 |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring February 2029 [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 2,068,000 | 2,068,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.57 | $ 1.57 |  |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  | 20,000,000
Cumulative Stock Repurchased (in shares) |  | 934,100 | 934,100 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  | $ 3.99 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) |  | 19,100,000 | 19,100,000 |  |  |  |
Common Stock Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in dollars per share) |  |  |  |  |  | $ 0 |
Minimum [Member] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 0.01 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 2,800,062 |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 5,100,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 1,200,000 |  | $ 1,600,000 |  |

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