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Note 13 - Equity Incentive Plan - Granted and Exercised Stock-based Compensation Awards (Details) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Employee Stock Option [Member] |  |
Grants: |  |
Stock options (in shares) | 199,970 | 440,688
Exercises: |  |
Stock options (in shares) | 284,548 | 12,941
Restricted Stock [Member] |  |
Grants: |  |
Restricted stock grants (in shares) | 64,578 | 26,306
Restricted Stock Units (RSUs) [Member] |  |
Grants: |  |
Restricted stock grants (in shares) | 15,457 | 9,970
Stock Appreciation Rights (SARs) [Member] |  |
Exercises: |  |
SARs (in shares) |  | 5,000

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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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