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Note 1 - Nature of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Dividend yield |  |  | .47% |  |  |  | .44% to .53% |  |  |  | .86% |
Expected volatility |  |  | 29.07% to 29.18% |  |  |  | 29.50% to 30.56% |  |  |  | 29.36% |
Risk-free interest rate |  |  | 2.69% to 2.82% |  |  |  | 1.71% to 2.90% |  |  |  | 1.98% |
Expected life of option grants (years) |  |  | 6 |  |  |  | 6 |  |  |  | 6 |
Weighted-average grant date fair value |  | $ | 5.68 |  |  | $ | 5.14 |  |  | $ | 2.79 |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Dividend yield |  |  | .46% to .47% |  |  |  | .53% to .61% |  |  |  | .61% to .88% |
Expected volatility |  |  | 16.96% to 19.35% |  |  |  | 23.05% to 24.25% |  |  |  | 27.20% to 31.11% |
Risk-free interest rate |  |  | .04% to .12% |  |  |  | .10% to .18% |  |  |  | .03% to .18% |
Expected life of purchase grants (months) |  |  | 3 to 6 |  |  |  | 3 to 6 |  |  |  | 3 to 6 |
Weighted-average grant date fair value |  | $ | 2.37 |  |  | $ | 2.10 |  |  | $ | 1.71 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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