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Note 8 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 37 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 07, 2019 USD ($) $ / shares | Jul. 20, 2018 $ / shares shares | Mar. 31, 2019 USD ($) $ / shares $ / oz shares | Mar. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / oz shares | Feb. 23, 2016 USD ($) | May 08, 2012 shares
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  | 0 | 335,349 |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement | $ |  |  |  | $ 1,200 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  |  | $ 3.65 |  |  |
Dividends, Common Stock, Total | $ |  |  | $ 1,209 | $ 998 |  |  |
Average Realized Silver Price | $ / oz |  |  | 15.7 |  |  |  |
Average Realized Silver Price, Minimum Dividend, Threshold | $ / oz |  |  | 30 |  | 30 |  |
Stock Issued During Period, Shares, New Issues |  |  | 0 |  | 7,173,614 |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  |  | $ 24,500 |  |
Payments for Brokerage Fees | $ |  |  |  |  | $ 600 |  |
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 |  |  |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  | $ 3.99 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  | 20,000,000
Cumulative Stock Repurchased |  |  | 934,100 |  | 934,100 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  | 19,100,000 |  | 19,100,000 |  |
Stock Repurchased During Period, Shares |  |  | 0 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares | $ 0.0025 |  |  |  |  |  |
Dividends, Common Stock, Total | $ | $ 1,200 |  |  |  |  |  |
Subsequent Event [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Share Price | $ / shares | $ 2.10 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  | $ 0.01 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Common Stock, Aggregate Offering Price | $ |  |  |  |  |  | $ 75,000 |
Restricted Stock Units and Performance Shares [Member] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  | $ 1,600 | $ 1,100 |  |  |

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