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Note 1 - Nature of Business and Significant Accounting Policies - Option Pricing Model Valuation Assumptions (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Expected life of option grants (Year) | 10 years |  |
Weighted-average grant date fair value (in dollars per share) | $ 14.75 | $ 7.31 | $ 5.11
Employee Stock Option [Member] |  |  |
Expected life of option grants (Year) | 6 years | 6 years | 6 years
Weighted-average grant date fair value (in dollars per share) | $ 14.75 | $ 7.31 | $ 5.11
Employee Stock Option [Member] | Minimum [Member] |  |  |
Dividend yield | 0.36% | 0.35% | 0.37%
Expected volatility | 29.64% | 29.32% | 28.92%
Risk-free interest rate | 2.50% | 1.73% | 1.89%
Employee Stock Option [Member] | Maximum [Member] |  |  |
Dividend yield | 0.47% | 0.51% | 0.46%
Expected volatility | 29.95% | 29.37% | 29.32%
Risk-free interest rate | 2.81% | 2.18% | 2.37%
Stock Purchase Grants [Member] |  |  |
Weighted-average grant date fair value (in dollars per share) | $ 6.42 | $ 3.28 | $ 2.39
Stock Purchase Grants [Member] | Minimum [Member] |  |  |
Dividend yield | 0.37% | 0.33% | 0.37%
Expected volatility | 19.80% | 12.70% | 8.81%
Risk-free interest rate | 0.67% | 0.39% | 0.09%
Expected life of option grants (Year) | 90 days | 90 days | 90 days
Stock Purchase Grants [Member] | Maximum [Member] |  |  |
Dividend yield | 0.42% | 0.59% | 0.45%
Expected volatility | 19.86% | 15.60% | 13.10%
Risk-free interest rate | 1.18% | 0.57% | 0.016%
Expected life of option grants (Year) | 180 days | 180 days | 180 days

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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=96867065&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=96867065&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=96867065&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=96867065&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 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: 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 + Details
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