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Note 6 - Stock-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2014 Director [Member] Common Class A [Member] Restricted Stock [Member] January 01, 2015 [Member] | Jun. 30, 2014 Director [Member] Restricted Stock [Member] | Jun. 30, 2013 Director [Member] Restricted Stock [Member] | Jun. 30, 2014 Common Class A [Member] Restricted Stock [Member] January 17, 2015 [Member] Employee [Member] | Jun. 30, 2014 Common Class A [Member] Restricted Stock [Member] January 17, 2016 [Member] Employee [Member] | Jun. 30, 2014 Common Class A [Member] Restricted Stock [Member] January 17, 2017 [Member] Employee [Member] | Jun. 30, 2014 Common Class A [Member] Restricted Stock [Member] Employee [Member] | Jun. 30, 2014 Common Class A [Member] Restricted Stock [Member] Director [Member] | Jun. 30, 2014 Common Class A [Member] Restricted Stock [Member] | Jun. 30, 2013 Common Class A [Member] Restricted Stock [Member] | Jun. 30, 2014 Common Class A [Member] | Jun. 30, 2014 Restricted Stock [Member] January 17, 2015 [Member] Employee [Member] | Jun. 30, 2014 Restricted Stock [Member] January 17, 2016 [Member] Employee [Member] | Jun. 30, 2014 Restricted Stock [Member] January 17, 2017 [Member] Employee [Member] | Jun. 30, 2014 Restricted Stock [Member] March 19, 2015 [Member] Employee [Member] | Jun. 30, 2014 Restricted Stock [Member] March 19, 2016 [Member] Employee [Member] | Mar. 19, 2014 Restricted Stock [Member] Employee [Member] | Jun. 30, 2014 Restricted Stock [Member] Employee [Member] | Jun. 30, 2013 Restricted Stock [Member] Employee [Member] | Dec. 31, 2013 Restricted Stock [Member] Employee [Member] | Jun. 30, 2014 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member]
Note 6 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  | 63,210 |  |  |  | 194,413 | 41,881 | 236,294 | 0 |  |  |  |  |  |  |  | 312,961 | 318,852 |  | 312,961 | 382,062
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  |  |  | 63,210 |  |  |  |  | 31,821 |  | 31,821 | 0 |  |  |  |  |  |  | 70,542 | 68,991 |  | 107,224 | 202,743 | 107,224
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  |  |  |  | 41,881 |  |  | 75,412 | 43,590 | 43,590 |  |  |  |  |  | 127,316 | 58,327 | 58,327 | 70,542 | 70,542 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 274,746 | 274,746 | 364,568 | 1,316,068 |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars) | $ 3.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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 -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 As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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