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Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Expected life of option grants (years) |  | 10 years |
Weighted-average grant date fair value (in Dollars per share) | $ 5.14 | $ 2.79 | $ 2.74
Employee Stock Option [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield |  | 0.86% |
Expected volatility |  | 29.36% |
Risk-free interest rate |  | 1.98% |
Expected life of option grants (years) | 6 years | 6 years | 6 years
Weighted-average grant date fair value (in Dollars per share) | $ 5.14 | $ 2.79 | $ 2.74
Employee Stock Option [Member] | Minimum [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.44% |  | 0.88%
Expected volatility | 29.50% |  | 29.64%
Risk-free interest rate | 1.71% |  | 1.90%
Employee Stock Option [Member] | Maximum [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.53% |  | 1.00%
Expected volatility | 30.56% |  | 30.30%
Risk-free interest rate | 2.90% |  | 3.58%
Stock Purchase Grants [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield |  |  |
Expected volatility |  |  |
Risk-free interest rate |  |  |
Expected life of option grants (years) |  |  |
Weighted-average grant date fair value (in Dollars per share) | $ 2.10 | $ 1.71 | $ 1.68
Stock Purchase Grants [Member] | Minimum [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.53% | 0.61% | 0.88%
Expected volatility | 23.05% | 27.20% | 51.62%
Risk-free interest rate | 0.10% | 0.03% | 0.08%
Expected life of option grants (years) | 3 years | 3 years | 3 years
Stock Purchase Grants [Member] | Maximum [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.61% | 0.88% | 1.12%
Expected volatility | 24.25% | 31.11% | 53.58%
Risk-free interest rate | 0.18% | 0.18% | 0.23%
Expected life of option grants (years) | 6 years | 6 years | 6 years

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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