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Note 8 - Equity Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended |  |  |  | 9 Months Ended | 0 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Common Stock [Member] | Mar. 01, 2014 Common Stock [Member] | Jan. 02, 2013 Common Stock [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] Five Year Anniversary [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] Ten Year Anniversary [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] Fifteen Year Anniversary [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] Twenty Year Anniversary [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] Twenty Five Year Anniversary [Member] | Mar. 01, 2014 Restricted Stock Units (RSUs) [Member] | Jan. 02, 2013 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2014 Match [Member] | Sep. 30, 2013 Match [Member]
Note 8 - Equity Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 7,000 | 11,667 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars) | $ 103 | $ 218 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  |  |  | 2,544 | 1,800 | 34,226 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Share Price (in Dollars per share) |  |  |  | $ 27.51 | $ 23.41 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Number of Shares Per Employee | 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Matching Purchase Requirement | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Match | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Matched |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,375 | 7,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars) |  |  |  |  |  | $ 25 | $ 50 | $ 75 | $ 100 | $ 100 |  |  | $ 7 |  |
Restricted Stock Units Units Number Converted | 1,250 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |

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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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