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Note 8 - Shareholders' Equity (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2015 USD ($) $ / shares | Jul. 01, 2015 USD ($) shares | Mar. 05, 2015 shares | Sep. 30, 2015 $ / shares $ / oz shares | Sep. 30, 2014 $ / shares | Sep. 30, 2015 USD ($) $ / shares $ / oz shares | Sep. 30, 2014 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) | Nov. 02, 2015 $ / shares | Jun. 15, 2015 CAD / shares | May. 08, 2012 shares
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  | 235,134 |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ / shares |  |  |  | $ 0.0025 | $ 0.0025 | $ 0.0075 | $ 0.0075 |  |  |  |
undefined (in Dollars per Ounce) | $ / oz |  |  |  | 14.54 |  |  |  |  |  |  |
Average Realized Silver Price, Minimum Dividend Threshold (in Dollars per Ounce) | $ / oz |  |  |  | 30 |  | 30 |  |  |  |  |
Share Price (in Dollars per share) | CAD / shares |  |  |  |  |  |  |  |  |  | CAD 3.06 |
Class of Warrant or Right, Outstanding |  |  |  | 2,249,550 |  | 2,249,550 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  | 0.1622 |  | 0.1622 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ / shares |  |  |  | $ 6.17 |  | $ 6.17 |  |  |  |  |
Non-employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  |  | 150,378 |  |  |  |
Employees and Non-employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  |  |  |  | $ 4.0 | $ 3.8 |  |  |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars 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 |  |  |  |  |
Satisfy Withholding Obligations [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation |  |  |  |  |  | 613,698 | 695,961 |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation (in Dollars) | $ |  |  |  |  |  | $ 1.9 | $ 2.3 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares |  |  |  |  |  | $ 3.05 | $ 3.27 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ / shares | $ 0.0025 |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock (in Dollars) | $ | $ 0.9 |  |  |  |  |  |  |  |  |  |
Share Price (in Dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 2.13 |  |
Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 911,148 |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  |  |  |  |  |  |  | $ 3.0 |  |  |
Vesting One Third in July 2016, One Third in July 2017, and One Third in July 2018 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 1,936,057 |  |  |  |  |  |  |  |  |
Vesting One Half in July 2016 and One Half in 2017 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 149,597 |  |  |  |  |  |  |  |  |
Vesting in July 2016 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 77,862 |  |  |  |  |  |  |  |  |
Vesting in July 2016 [Member] | Restricted Stock Units (RSUs) [Member] | Recognized Over the Next 12 Months [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  | $ 1.9 |  |  |  |  |  |  |  |  |
Vesting in July 2017 [Member] | Restricted Stock Units (RSUs) [Member] | Recognized Over the Next 24 Months [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  | 1.8 |  |  |  |  |  |  |  |  |
Vesting in July 2018 [Member] | Restricted Stock Units (RSUs) [Member] | Recognized Over the Next 36 Months [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | $ |  | $ 1.6 |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Note 8 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 |  |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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