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Note 8 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 25 Months Ended | 71 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 09, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / item shares | Mar. 31, 2018 USD ($) $ / shares $ / item shares | Mar. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / item shares | Mar. 31, 2018 $ / shares $ / item shares | May 08, 2018 $ / shares | Feb. 23, 2016 USD ($) | May 08, 2012 shares
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | shares |  | 1,237,369 |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  | $ 4.9 | $ 1.1 | $ 1.3 |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation | shares |  |  | 335,349 | 154,933 |  |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation | $ |  |  | $ 1.2 | $ 0.7 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  | $ 3.65 | $ 4.67 |  |  |  |  |
Average Realized Silver Price | $ / item |  |  | 16.84 |  |  |  |  |  |
Average Realized Silver Price, Minimum Dividend, Threshold | $ / item |  | 30 | 30 |  | 30 | 30 |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  | 0 |  | 4,608,847 |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  |  | $ 17.7 |  |  |  |
Payments for Brokerage Fees | $ |  |  |  |  | $ 0.4 |  |  |  |
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 | shares |  |  |  |  |  |  |  |  | 20,000,000
Cumulative Stock Repurchased | shares |  | 934,100 | 934,100 |  | 934,100 | 934,100 |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares |  | 19,100,000 | 19,100,000 |  | 19,100,000 | 19,100,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares | $ 0.0025 |  |  |  |  |  |  |  |
Dividends, Common Stock, Total | $ | $ 1.0 |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  | $ 3.97 |  |
Subsequent Event [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  | $ 3.97 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  | $ 0.01 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Common Stock, Aggregate Offering Price | $ |  |  |  |  |  |  |  | $ 75.0 |

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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 Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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