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Note 8 - Shareholders' Equity (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 14 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 06, 2013 | Jun. 21, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | May 07, 2013 | Jun. 30, 2013 Vesting in 2014 [Member] | Jun. 30, 2013 Vesting in 2015 and 2016 [Member] | May 08, 2012 Common Stock [Member] | Jun. 21, 2013 Vesting in 2014 [Member] | Aug. 06, 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) |  |  | 122,250 | 77,976 |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | 1,900,000 | 1,500,000 |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in Shares) |  |  |  |  | 83,433 |  | 400,300 |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  |  |  |  | $ 1.55 |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in Dollars per share) | $ 0.0025 |  | $ 0.0025 | $ 0.0225 | $ 0.0050 | $ 0.0350 |  |  |  |  |  |  |
Dividends, Common Stock | 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Average Realized Silver Price | 16.27 |  |  |  |  |  |  |  |  |  |  |  | 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) |  |  |  |  |  |  |  | $ 2.95 |  |  |  |  |

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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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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