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Note 12 - Equity Incentive Plan - Summary of Exercisable Options and SAR's (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Incentive Stock Options [Member] |
Exercisable Options and SAR's outstanding (in shares) | shares | 182,472
Exercisable Options and SAR's, Weighted Average Exercise Price (in dollars per share) | $ / shares | $ 14.12
Exercisable Options and SAR's, Weighted Average Remaining Term (Year) | 4 years 109 days
Non-qualified Stock Options [Member] |
Exercisable Options and SAR's outstanding (in shares) | shares | 374,211
Exercisable Options and SAR's, Weighted Average Exercise Price (in dollars per share) | $ / shares | $ 20.18
Exercisable Options and SAR's, Weighted Average Remaining Term (Year) | 5 years 109 days
Performance Shares [Member] |
Exercisable Options and SAR's outstanding (in shares) | shares | 32,598
Exercisable Options and SAR's, Weighted Average Exercise Price (in dollars per share) | $ / shares | $ 38.79
Exercisable Options and SAR's, Weighted Average Remaining Term (Year) | 7 years 255 days
Stock Appreciation Rights (SARs) [Member] |
Exercisable Options and SAR's outstanding (in shares) | shares | 35,250
Exercisable Options and SAR's, Weighted Average Exercise Price (in dollars per share) | $ / shares | $ 6.36
Exercisable Options and SAR's, Weighted Average Remaining Term (Year) | 2 years 36 days

X
- Definition The number of shares into which non-option equity payment awards outstanding as of the balance sheet date can be currently converted. + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance for stock appreciation rights. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for exercisable non-option awards and stock appreciation rights. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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