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Note 1 - Nature of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Accounting Policies [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Dividend yield |  | .44% | to | .53% |  |  |  | .86% |  |  | .88% | to | 1.00% |
Expected volatility |  | 29.50% | to | 30.56% |  |  |  | 29.36% |  |  | 29.64% | to | 30.30% |
Risk-free interest rate |  | 1.71% | to | 2.90% |  |  |  | 1.98% |  |  | 1.90% | to | 3.58% |
Expected life of option grants (years) |  |  | 6 |  |  |  |  | 6 |  |  |  | 6 |  |
Weighted-average grant date fair value |  |  | $5.14 |  |  |  |  | $2.79 |  |  |  | $2.74 |  |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Dividend yield |  | .53% | to | .61% |  |  | .61% | to | .88% |  |  | .88% | to | 1.12% |
Expected volatility |  | 23.05% | to | 24.25% |  |  | 27.20% | to | 31.11% |  |  | 51.62% | to | 53.58% |
Risk-free interest rate |  | .10% | to | .18% |  |  | .03% | to | .18% |  |  | .08% | to | .23% |
Expected life of purchase grants (months) |  | 3 | to | 6 |  |  | 3 | to | 6 |  |  | 3 | to | 6 |
Weighted-average grant date fair value |  |  | $2.10 |  |  |  |  | $1.71 |  |  |  |  | $1.68 |  |

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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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