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Note 7 - Shareholders' Equity (Details) - Information About Stock Options Outstanding (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 2,131,622 | 2,211,488 | 2,356,228
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 4 years 116 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 6.99 | $ 7.47 | $ 8.34
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 1,107,116 | 1,013,098 |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 6.32 | $ 7.64 |
Price Range $3.22 To 3.79 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 3.22 |  |
Range of Exercise Prices, Upper Limit | $ 3.79 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 197,834 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 5 years 9 months |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 3.43 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 42,191 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 3.22 |  |
Price Range $3.80 To $3.91 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 3.80 |  |
Range of Exercise Prices, Upper Limit | $ 3.91 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 241,000 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 4 years 36 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 3.88 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 166,000 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 3.91 |  |
Price Range $3.92 To $4.41 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 3.92 |  |
Range of Exercise Prices, Upper Limit | $ 4.41 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 254,750 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 4 years 69 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 4.17 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 150,752 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 4.27 |  |
Price Range $4.42 To $4.69 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 4.42 |  |
Range of Exercise Prices, Upper Limit | $ 4.69 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 293,000 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 4 years 361 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 4.42 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 195,334 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 4.42 |  |
Price Range $4.70 To $5.46 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 4.70 |  |
Range of Exercise Prices, Upper Limit | $ 5.46 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 85,800 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 3 years 255 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 5.19 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 68,601 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 5.12 |  |
Price Range $5.47 To $6.42 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 5.47 |  |
Range of Exercise Prices, Upper Limit | $ 6.42 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 300,000 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 4 years 18 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 6.42 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 150,000 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 6.42 |  |
Price Range $6.43 To $10.55 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 6.43 |  |
Range of Exercise Prices, Upper Limit | $ 10.55 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 412,166 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 3 years 321 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 8.93 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 187,166 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 8.10 |  |
Price Range $10.56 To $12.74 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 10.56 |  |
Range of Exercise Prices, Upper Limit | $ 12.74 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 91,572 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 1 year 171 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 12.40 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 91,572 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 12.40 |  |
Price Range $12.75 To $13.22 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 12.75 |  |
Range of Exercise Prices, Upper Limit | $ 13.22 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 21,000 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 1 year 175 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 13.22 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 21,000 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 13.22 |  |
Price Range $13.23 To $15.00 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 13.23 |  |
Range of Exercise Prices, Upper Limit | $ 15.00 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 234,500 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 5 years 109 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 14.77 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 34,500 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 13.43 |  |
Price Range $3.22 To $15.00 [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices, Lower Limit | $ 3.22 |  |
Range of Exercise Prices, Upper Limit | $ 15.00 |  |
Range of Exercise Prices, Options Outstanding, Number (in Shares) | 2,131,622 |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life | 4 years 116 days |  |
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price | $ 7.18 |  |
Range of Exercise Prices, Options Exercisable, Number (in Shares) | 1,107,116 |  |
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price | $ 6.32 |  |

X
- 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 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=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 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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