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Note 10 - Equity Plans (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 13, 2017 | Jul. 01, 2016 | May 01, 2016 | Mar. 01, 2015 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options Converted into Shares, Intrinsic Value |  |  |  |  |  | $ 0 | $ 0 | $ 0
Senior Management Compensation Program [Member] |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  | 73,021 |  |
Restricted Stock Units (RSUs) [Member] | Supplemental Employee Retirement Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  | 26,837 | 51,075 | 47,639
Restricted Stock Units (RSUs) [Member] | Senior Management Stock Incentive Program [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 5 years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Participant's Base Salary |  | 10.00% |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee |  | $ 17,500 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Senior Management Compensation Program [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Remaining Liability Reversed |  | 1,000,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Senior Management Compensation Program [Member] | Five Year Anniversary [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | 25,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Senior Management Compensation Program [Member] | Ten Year Anniversary [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | 50,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Senior Management Compensation Program [Member] | Fifteen Year Anniversary [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | 75,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Senior Management Compensation Program [Member] | Twenty Five Year Anniversary [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | 100,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Senior Management Compensation Program [Member] | Twenty Year Anniversary [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | $ 100,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Non-Employee Director [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 3,501 |  | 3,094 | 4,639 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 1 year |  |
Restricted Stock Units (RSUs) [Member] | Executive Vice President and Chief Operating Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 10,573 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 5 years |  |  |
Match [Member] | Senior Management Compensation Program [Member] |  |  |  |  |  |  |  |
Shares Matched |  |  |  |  |  |  | 2,500 | 9,000
Common Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 1,000,000 |  |
Share Price | $ 19.99 |  | $ 22.62 | $ 15.09 |  |  |  |

X
- 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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X
- 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=96867065&loc=d3e5070-113901 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition Number of shares distributed to participants who purchase the required amount on the open market. + References No definition available. + Details
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- Definition The intrinsic value of equity instruments other than options which were converted into shares during the period. + References No definition available. + Details
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- Definition The number of shares a participant is required to purchase on the open market in order to receive award. + References No definition available. + Details
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- Definition The minimum quantity of shares a participant is required to own to participate in compensation program. + References No definition available. + Details
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- Definition The maximum awards to each employee under the plan per period. + References No definition available. + Details
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- Definition The percentage of the participant's base salary that is used to determine the share-based compensation. + References No definition available. + Details
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- Definition The amount of the remaining liabilities were reversed associated the modification of the plan. + References No definition available. + Details
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