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Note 6 - Share-based Compensation - Stock Appreciation Rights Outstanding (Details) - $ / shares | 9 Months Ended |
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Sep. 30, 2017 | Dec. 31, 2016
Lower range of exercise prices on options (in dollars per share) | $ 3.82 |
Upper range of exercise prices on options (in dollars per share) | 21.63 |
Stock Appreciation Rights (SARs) [Member] |  |
Lower range of exercise prices on options (in dollars per share) | 5.65 |
Upper range of exercise prices on options (in dollars per share) | $ 21.63 |
Outstanding SARs (in shares) | 241,432 | 325,506
Weighted average remaining contractual life (Year) | 2 years 127 days |
Weighted average exercise price (in dollars per share) | $ 13.28 | $ 10.26
Exercise Price Range 1 [Member] |  |
Lower range of exercise prices on options (in dollars per share) | 3.82 |
Upper range of exercise prices on options (in dollars per share) | 5.55 |
Exercise Price Range 1 [Member] | Stock Appreciation Rights (SARs) [Member] |  |
Lower range of exercise prices on options (in dollars per share) | 5.65 |
Upper range of exercise prices on options (in dollars per share) | $ 7.36 |
Outstanding SARs (in shares) | 94,928 |
Weighted average remaining contractual life (Year) | 1 year 32 days |
Weighted average exercise price (in dollars per share) | $ 6.95 |
Exercise Price Range 2 [Member] |  |
Lower range of exercise prices on options (in dollars per share) | 5.65 |
Upper range of exercise prices on options (in dollars per share) | 7.36 |
Exercise Price Range 2 [Member] | Stock Appreciation Rights (SARs) [Member] |  |
Lower range of exercise prices on options (in dollars per share) | 16.35 |
Upper range of exercise prices on options (in dollars per share) | $ 21.63 |
Outstanding SARs (in shares) | 146,504 |
Weighted average remaining contractual life (Year) | 3 years 62 days |
Weighted average exercise price (in dollars per share) | $ 17.38 |

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- Definition The weighted average exercise price for non-option equity instruments. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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 (e)(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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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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