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Note 8 - Shareholders' Equity (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 43 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 05, 2019 | Jul. 20, 2018 | Jun. 30, 2019 | Apr. 30, 2019 | Feb. 28, 2012 | Sep. 30, 2011 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Nov. 05, 2019 | Feb. 23, 2016 | May 08, 2012
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  |  | 1,060,480 | 697,341 |  |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement |  |  |  |  |  |  |  |  |  |  | $ 2,200,000 | $ 2,700,000 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  | $ 2.11 | $ 3.86 |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.0025 |  |  |  |  |  | $ 0.0025 |  |  | $ 0.0025 | $ 0.0075 | $ 0.0075 |  |  |  |
Dividends, Common Stock, Total | $ 1,200,000 |  |  |  |  |  | $ 1,225,000 |  |  | $ 1,196,000 | $ 3,655,000 | $ 3,196,000 |  |  |  |
Average Realized Silver Price Per Ounce |  |  |  |  |  |  |  | $ 15.01 |  |  |  |  |  |  |  |
Average Realized Silver Price, Minimum Dividend, Threshold |  |  |  |  |  |  | $ 30 |  |  |  | $ 30 |  | $ 30 |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  | 0 |  | 7,173,614 |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  |  | $ 3,086,000 |  | $ 3,086,000 | $ 24,500,000 |  |  |
Payments for Brokerage Fees |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 8.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 1.57 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  | $ 3.99 |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000
Cumulative Stock Repurchased |  |  |  |  |  |  | 934,100 |  |  |  | 934,100 |  | 934,100 |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  |  |  |  |  | 19,100,000 |  |  |  | 19,100,000 |  | 19,100,000 |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Common Stock Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.30 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Aggregate Offering Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 3,597,380 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | $ 8,300,000 |  | $ 4,700,000 |  |  |  |  |
Performance Shares [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 30 months |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 5,900,000 |  |  |  |  |  |  |  | 4,800,000 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 2,971,188 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 165,764 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 63,589 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting in 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  | $ 2,100,000 |  |  |  | $ 2,100,000 |  | $ 2,100,000 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting in 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  | 2,000,000.0 |  |  |  | $ 2,000,000.0 |  | 2,000,000.0 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting in 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  | $ 1,800,000 |  |  |  | $ 1,800,000 |  | $ 1,800,000 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |  |

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- Definition The minimum average realized silver price per ounce that must be met for the silver-price-linked component of dividends to be declared. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The amount of cash paid for brokerage fees during the current period. This element is intended to represent the brokerage fees paid by and between financial industry participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
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