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Note 17 - Stock-based Compensation (Details) - Stock Options Outstanding and Exercisable - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Stock options outstanding (in Shares) | 298,740 | 759,683 | 503,834 | 722,155
Outstanding options, weighted-average exercise price | $ 9.97 | $ 11.36 | $ 10.41 | $ 10.18
Outstanding options, weighted-average remaining contractual life | 2 years 306 days |  |  |
Stock options exercisable (in Shares) | 225,580 |  |  |
Exercisable options, weighted-average exercise price | $ 9.99 |  |  |
Range 1 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding options, exercise price range, lower limit | 5.76 |  |  |
Outstanding options, exercise price range, upper Limit | $ 9.21 |  |  |
Stock options outstanding (in Shares) | 162,269 |  |  |
Outstanding options, weighted-average exercise price | $ 5.76 |  |  |
Outstanding options, weighted-average remaining contractual life | 2 years 346 days |  |  |
Exercisable options, exercise price range, lower limit | $ 5.76 |  |  |
Exercisable options, exercise price range, upper limit | $ 9.21 |  |  |
Stock options exercisable (in Shares) | 105,359 |  |  |
Exercisable options, weighted-average exercise price | $ 5.76 |  |  |
Range 2 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding options, exercise price range, lower limit | 9.22 |  |  |
Outstanding options, exercise price range, upper Limit | $ 15.47 |  |  |
Stock options outstanding (in Shares) | 108,529 |  |  |
Outstanding options, weighted-average exercise price | $ 12.41 |  |  |
Outstanding options, weighted-average remaining contractual life | 1 year 215 days |  |  |
Exercisable options, exercise price range, lower limit | $ 9.22 |  |  |
Exercisable options, exercise price range, upper limit | $ 15.47 |  |  |
Stock options exercisable (in Shares) | 101,859 |  |  |
Exercisable options, weighted-average exercise price | $ 12.51 |  |  |
Range 3 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding options, exercise price range, lower limit | 15.48 |  |  |
Outstanding options, exercise price range, upper Limit | $ 22.66 |  |  |
Stock options outstanding (in Shares) | 18,794 |  |  |
Outstanding options, weighted-average exercise price | $ 19.28 |  |  |
Outstanding options, weighted-average remaining contractual life | 6 years 295 days |  |  |
Exercisable options, exercise price range, lower limit | $ 15.48 |  |  |
Exercisable options, exercise price range, upper limit | $ 22.66 |  |  |
Stock options exercisable (in Shares) | 15,714 |  |  |
Exercisable options, weighted-average exercise price | $ 19.45 |  |  |
Range 4 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding options, exercise price range, lower limit | 22.67 |  |  |
Outstanding options, exercise price range, upper Limit | $ 49.50 |  |  |
Stock options outstanding (in Shares) | 9,148 |  |  |
Outstanding options, weighted-average exercise price | $ 36.61 |  |  |
Outstanding options, weighted-average remaining contractual life | 7 years 237 days |  |  |
Exercisable options, exercise price range, lower limit | $ 22.67 |  |  |
Exercisable options, exercise price range, upper limit | $ 49.50 |  |  |
Stock options exercisable (in Shares) | 2,648 |  |  |
Exercisable options, weighted-average exercise price | $ 24.59 |  |  |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=6415400&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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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=6415400&loc=d3e5070-113901 + Details
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