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Note 7 - Shareholders' Equity (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended |  |  |  | 6 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2008 | Dec. 31, 2005 | Jun. 30, 2013 | Jun. 30, 2013 | Jul. 01, 2012 | Dec. 31, 2012 | Jan. 03, 2011 | Mar. 07, 2008 | Dec. 19, 2005 | Jun. 30, 2013 Employee Stock Option [Member] | Jul. 01, 2012 Employee Stock Option [Member] | Jun. 30, 2013 Employee Stock Option [Member] | Jul. 01, 2012 Employee Stock Option [Member] | Jan. 29, 2013 Restricted Stock Units (RSUs) [Member] Chief Executive Officer [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jul. 01, 2012 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jul. 01, 2012 Restricted Stock [Member] | Jan. 29, 2013 Vesting Condition 1 [Member] | Jan. 29, 2013 Vesting Condition 2 [Member] | Jan. 29, 2013 Vesting Condition 3 [Member] | Jan. 29, 2013 Vesting Condition 4 [Member] | Jun. 30, 2013 Long-Term Incentive Plan [Member] | Dec. 31, 2011 Long-Term Incentive Plan [Member] | Jun. 30, 2004 Long-Term Incentive Plan [Member] | Jun. 30, 2013 Incentive Stock Options [Member] Minimum [Member] | Jun. 30, 2013 Incentive Stock Options [Member] Maximum [Member] | Jun. 30, 2013 Non Qualified Stock Options [Member] Minimum [Member] | Dec. 31, 2010 Option Grant 1 [Member] | Dec. 30, 2010 Option Grant 1 [Member] | Dec. 31, 2010 Option Grant 2 [Member] | Dec. 30, 2010 Option Grant 2 [Member] | Dec. 31, 2010 Option Grant 3 [Member] | Dec. 30, 2010 Option Grant 3 [Member] | Dec. 31, 2010 Option Grant 4 [Member] | Dec. 30, 2010 Option Grant 4 [Member]
Note 7 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares |  |  |  |  | 1,372,757 | 1,372,757 |  | 1,372,757 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value (in Dollars) |  |  |  |  | $ 7,658,000 | $ 7,658,000 |  | $ 7,658,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  | 40,000,000 | 40,000,000 |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 | 750,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 5 years | 3 years | 4 years |  | 4 years |  | 4 years |  | 4 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  | 2,169,538 | 2,169,538 |  | 2,211,488 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,119,538 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 50,000 |  | 50,000 | 48,000 |  | 153,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  | 250,000 |  | 200,000 |  | 200,000 |
Share Price (in Dollars per share) |  |  |  |  |  |  |  |  | $ 6.58 | $ 12.74 | $ 12.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.42 |  | $ 6.42 |  | $ 10.00 |  | $ 15.00
Share Based Payment Award Options Annual Incremental Vesting | 12,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 | 30,000 | 30,000 | 30,000 |  |  |  |  |  |  | 12,500 |  | 62,500 |  | 50,000 |  | 50,000 |
Minimum Share Price Requirement (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.00 | $ 5.00 | $ 4.00 | $ 5.00 |  |  |  |  |  |  |  |  |  |  |  | $ 10.00 |  | $ 15.00
Number Of Days In Period Minimum Share Price Requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 15 | 15 | 15 |  |  |  |  |  |  |  |  |  |  | 15 |  | 15 |
Number Of Days In Period Minimum Share Price Requirement Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 30 | 30 | 30 |  |  |  |  |  |  |  |  |  |  | 30 |  | 30 |
Share Based Payment Award Options Term |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation (in Dollars) |  |  |  |  |  | 430,000 | 670,000 |  |  |  |  | 200,000 | 252,000 | 390,000 | 516,000 |  | 40 | 0 | 40 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) |  |  |  |  |  |  |  |  |  |  |  | 917,000 |  | 917,000 |  |  | 394 |  | 394 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  | 1 year 237 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars) |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Stock Options Exercised (in Dollars) |  |  |  |  |  | 12,000 | 115,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 120,000 | 120,000 |  |  |  |  |  |  |  |  |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross (in Dollars) |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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 Aggregate value of stock related to Restricted Stock Awards issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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