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Note 8 - Equity Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |  |
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Dec. 31, 2011 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Five Year Anniversary [Member] Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Ten Year Anniversary [Member] Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Fifteen Year Anniversary [Member] Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Twenty Year Anniversary [Member] Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Twenty Five Year Anniversary [Member] Restricted Stock Units (RSUs) [Member] | Mar. 02, 2014 Restricted Stock Units (RSUs) [Member] | Jan. 02, 2013 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Match [Member] | Mar. 31, 2013 Match [Member] | Mar. 31, 2014 Common Stock [Member] | Mar. 02, 2014 Common Stock [Member] | Jan. 02, 2013 Common Stock [Member]
Note 8 - Equity Plans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 7,000 | 1,667 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars) |  | $ 103 | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 4,750 | 6,000 |  |  |
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 |  |  | $ 709 |  |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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