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Note 12 - Share-based Compensation - Stock-Settled Stock Appreciation Rights Transactions (Details) - Stock Appreciation Rights (SARs) [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Outstanding SARS (in shares) | 325,506 | 381,566
Outstanding SARS, weighted average exercise price (in dollars per share) | $ 10.26 | $ 8.14
Granted SARS (in shares) | 43,988 | 58,108
Granted SARS, weighted average exercise price (in dollars per share) | $ 16.97 | $ 16.35
Exercised SARS (in shares) | (222,990) | (114,168)
Exercised SARS, weighted average exercise price (in dollars per share) | $ 6.90 | $ 6.27
Granted SARS (in shares) | 43,988 | 58,108
Exercised SARS (in shares) | (222,990) | (114,168)
Outstanding SARS (in shares) | 146,504 | 325,506
Outstanding SARS, weighted average exercise price (in dollars per share) | $ 17.38 | $ 10.26

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- Definition The weighted average exercise price for non-option equity instruments. + References No definition available. + Details
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Period Type: | instant

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- Definition The weighted average grant-date fair value of SARS exercised during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The weighted average exercise price of non-option equity instruments granted during the period. + References No definition available. + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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)(iv)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Details
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