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Note 8 - Shareholders' Equity (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 15 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 04, 2013 | Jun. 21, 2013 | Jun. 30, 2013 | May 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Nov. 01, 2013 | Sep. 30, 2013 Vesting in 2014 [Member] | Sep. 30, 2013 Vesting in 2015 and 2016 [Member] | May 08, 2012 Common Stock [Member] | Jun. 21, 2013 Vesting in 2014 [Member] | Nov. 04, 2013 Minimum [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 (in Shares) |  | 954,438 |  |  |  |  |  |  |  |  |  |  |  | 633,960 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 | $ 2,900,000 |  |  |
Stock Issued During Period, Shares, New Issues (in Shares) |  |  | 94,200 | 28,050 |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  | 3,300,000 | 2,300,000 |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in Shares) |  |  |  |  |  |  | 83,433 |  | 400,300 |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  |  |  |  |  |  | $ 2.86 |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ 0.0025 |  |  |  | $ 0.0025 | $ 0.0025 | $ 0.0075 | $ 0.0375 |  |  |  |  |  |  |
Dividends, Common Stock | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Realized Silver Price | 22.22 |  |  |  |  |  |  |  |  |  |  |  |  |  | 30
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Accelerated Share Repurchases, Final Price Paid Per Share (in Dollars per share) |  |  |  |  |  |  |  |  | $ 5.56 |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  | $ 19,600,000 |  |  |  |  |  |
Sale of Stock, Price Per Share (in Dollars per share) |  |  |  |  |  |  |  |  |  | $ 3.14 |  |  |  |  |

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + 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://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 2: 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 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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