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Note 5 - Stock Based Compensation (Details) (USD $) | 6 Months Ended |  |  | 6 Months Ended | 0 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 Employee Stock Option [Member] Contractual Term with One-fifth Yearly Vesting [Member] | Jun. 30, 2014 Employee Stock Option [Member] Contractual Term with One-third Yearly Vesting [Member] | Jun. 30, 2014 Employee Stock Option [Member] The 2004 Stock Option Plan [Member] | Jun. 30, 2014 Director Stock Options [Member] The 2003 Outside Directors Stock Plan [Member] | Jun. 30, 2014 Director Stock Options [Member] | Jul. 25, 2011 Chief Operating Officer [Member] The 2010 Stock Option Plan [Member]
Note 5 - Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Maximum Contractual Term |  |  |  |  |  |  | 10 years | 6 years |  |  | 10 years | 6 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  | 5 years | 3 years |  |  | 6 months | 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 0 |  | 0 |  |  |  |  |  |  |  |  | 60,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) | 300,800 | [1] | 390,800 | [2] | 362,800 | 528,800 |  |  | 131,600 | 169,200 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares) | 300,800 | [1] | 350,800 | [2] |  |  |  |  | 131,600 | 169,200 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share) | $ 9.85 | [1] | $ 9.98 | [2] | $ 9.53 | $ 9.82 |  |  | $ 10.72 | $ 9.18 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  | 73 days | 4 years 292 days |  |
Reduction in Stock Based Compensation Expense (in Dollars) | $ 54,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 7.85
[1] | Options with exercise prices ranging from $2.79 to $14.75
[2] | Options with exercise prices ranging from $5.50 to $14.75

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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