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Note 5 - Stock-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 3 Months Ended | 1 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Mar. 19, 2016 Scenario, Forecast [Member] Executive Officers [Member] | Mar. 19, 2015 Scenario, Forecast [Member] Executive Officers [Member] | Mar. 19, 2014 Scenario, Forecast [Member] Executive Officers [Member] | Jan. 31, 2014 Scenario, Forecast [Member] Non-Employee Directors [Member] | Sep. 30, 2013 Incentive Plan 2007 [Member] | Sep. 30, 2012 Incentive Plan 2007 [Member] | Sep. 30, 2013 Non-Employee Directors [Member] | Sep. 30, 2013 Restricted Stock [Member] | Sep. 30, 2013 Employee Stock Option [Member]
Note 5 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 382,062 | 432,396 |  |  |  |  | 318,852 | 432,396 | 63,210 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 107,224 | 0 | 70,542 | 70,542 | 70,542 | 63,210 | 107,224 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  | 359,568 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number |  |  |  |  |  |  |  |  |  | 107,224 | 63,616
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost (in Dollars) | $ 1.0 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in Dollars) | $ 1.6 |  |  |  |  |  |  |  |  |  |

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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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- Definition Number of shares for which recognition of compensation cost was accelerated. + References No definition available. + 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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