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Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Expected life of option grants | 10 years |  |
Weighted-average grant date fair value (in Dollars per share) | $ 5.11 | $ 5.68 | $ 5.14
Employee Stock Option [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield |  | 0.47% |
Expected volatility |  |  |
Risk-free interest rate |  |  |
Expected life of option grants | 6 years | 6 years | 6 years
Weighted-average grant date fair value (in Dollars per share) | $ 5.11 | $ 5.68 | $ 5.14
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 |  |  |
Weighted-average grant date fair value (in Dollars per share) | $ 2.39 | $ 2.37 | $ 2.10
Minimum [Member] | Employee Stock Option [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.37% |  | 0.44%
Expected volatility | 28.92% | 29.07% | 29.50%
Risk-free interest rate | 1.89% | 2.69% | 1.71%
Minimum [Member] | Stock Purchase Grants [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.37% | 0.46% | 0.53%
Expected volatility | 8.81% | 16.96% | 23.05%
Risk-free interest rate | 0.09% | 0.04% | 0.10%
Expected life of option grants | 3 years | 3 years | 3 years
Maximum [Member] | Employee Stock Option [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.46% |  | 0.53%
Expected volatility | 29.32% | 29.18% | 30.56%
Risk-free interest rate | 2.37% | 2.82% | 2.90%
Maximum [Member] | Stock Purchase Grants [Member] |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) - Option Pricing Model Valuation Assumptions [Line Items] |  |  |
Dividend yield | 0.45% | 0.47% | 0.61%
Expected volatility | 13.10% | 19.35% | 24.25%
Risk-free interest rate | 0.16% | 0.12% | 0.18%
Expected life of option grants | 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 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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- 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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