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Note 8 - Stock-Based Compensation (Details) - Stock Options Outstanding (USD $) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Stock Options Outstanding (in Shares) | 496,919 | 501,334 | 618,034 | 722,155
Weighted-Average Exercise Price | $ 11.20 | $ 10.34 | $ 10.48 | $ 10.18
Weighted-Average Remaining Contractual Life | 3 years 208 days |  |  |
Range 1 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Lower Exercise Price | $ 5.76 |  |  |
Upper Exercise Price | $ 8.00 |  |  |
Stock Options Outstanding (in Shares) | 237,579 |  |  |
Weighted-Average Exercise Price | $ 5.76 |  |  |
Weighted-Average Remaining Contractual Life | 4 years 193 days |  |  |
Range 2 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Lower Exercise Price | $ 8.01 |  |  |
Upper Exercise Price | $ 10.00 |  |  |
Stock Options Outstanding (in Shares) | 59,344 |  |  |
Weighted-Average Exercise Price | $ 9.79 |  |  |
Weighted-Average Remaining Contractual Life | 189 days |  |  |
Range 3 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Lower Exercise Price | $ 10.01 |  |  |
Upper Exercise Price | $ 20.00 |  |  |
Stock Options Outstanding (in Shares) | 109,994 |  |  |
Weighted-Average Exercise Price | $ 12.55 |  |  |
Weighted-Average Remaining Contractual Life | 3 years 105 days |  |  |
Range 4 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Lower Exercise Price | $ 20.01 |  |  |
Upper Exercise Price | $ 33.44 |  |  |
Stock Options Outstanding (in Shares) | 90,002 |  |  |
Weighted-Average Exercise Price | $ 24.81 |  |  |
Weighted-Average Remaining Contractual Life | 3 years 131 days |  |  |

X
- 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 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 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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