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Note 13 - Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Stock Options Outstanding |  | Stock Awards Outstanding |  | Stock Units Outstanding
|  | Number of Shares (000) |  | Weighted Average Exercise Price |  | Number of Shares (000) |  | Weighted Average Exercise Price |  | Number of Shares (000) |  | Weighted Average Exercise Price
Balance, December 31, 2013 |  |  | 185 |  |  | $ | 27.04 |  |  |  | 145 |  |  | $ | 26.00 |  |  |  | -- |  |  | $ | -- |
Granted |  |  | -- |  |  |  | -- |  |  |  | 134 |  |  |  | 37.51 |  |  |  | -- |  |  |  | -- |
Stock Options Exercised |  |  | (65 | ) |  |  | 25.86 |  |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | -- |
Stock Awards/Units Vested |  |  | -- |  |  |  | -- |  |  |  | (51 | ) |  |  | 30.62 |  |  |  | -- |  |  |  | -- |
Forfeited/Expired |  |  | -- |  |  |  | -- |  |  |  | (1 | ) |  |  | 26.54 |  |  |  | -- |  |  |  | -- |
Balance, December 31, 2014 |  |  | 120 |  |  |  | 27.72 |  |  |  | 227 |  |  |  | 31.88 |  |  |  | -- |  |  |  | -- |
Granted |  |  | 375 |  |  |  | 44.69 |  |  |  | 95 |  |  |  | 43.45 |  |  |  | 20 |  |  |  | 37.15 |
Stock Options Exercised |  |  | (71 | ) |  |  | 22.57 |  |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | -- |
Stock Options from Acquisitions |  |  | 66 |  |  |  | 20.43 |  |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | -- |
Stock Awards/Units Vested |  |  | -- |  |  |  | -- |  |  |  | (131 | ) |  |  | 34.77 |  |  |  | -- |  |  |  | -- |
Forfeited/Expired |  |  | (5 | ) |  |  | 24.49 |  |  |  | (20 | ) |  |  | 35.36 |  |  |  | -- |  |  |  | -- |
Balance, December 31, 2015 |  |  | 485 |  |  |  | 40.62 |  |  |  | 171 |  |  |  | 35.65 |  |  |  | 20 |  |  |  | 37.15 |
Granted |  |  | 58 |  |  |  | 47.02 |  |  |  | 136 |  |  |  | 46.92 |  |  |  | 108 |  |  |  | 46.95 |
Stock Options Exercised |  |  | (64 | ) |  |  | 30.28 |  |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | -- |
Stock Awards/Units Vested |  |  | -- |  |  |  | -- |  |  |  | (159 | ) |  |  | 41.91 |  |  |  | (12 | ) |  |  | 45.54 |
Forfeited/Expired |  |  | (6 | ) |  |  | 35.05 |  |  |  | (9 | ) |  |  | 43.70 |  |  |  | (3 | ) |  |  | 47.02 |
Balance, December 31, 2016 |  |  | 473 |  |  | $ | 42.85 |  |  |  | 139 |  |  | $ | 40.96 |  |  |  | 113 |  |  | $ | 45.40 |
Exercisable, December 31, 2016 |  |  | 322 |  |  | $ | 41.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number of Shares (000) |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number of Shares (000) |  | Weighted Average Exercise Price
$17.55 | - | $21.29 |  |  | 13 |  |  |  | 4.58 |  |  | $ | 19.93 |  |  |  | 8 |  |  | $ | 19.58 |
21.51 | - | 21.51 |  |  | 2 |  |  |  | 3.05 |  |  |  | 21.51 |  |  |  | 2 |  |  |  | 21.51 |
28.42 | - | 28.42 |  |  | 18 |  |  |  | 0.38 |  |  |  | 28.42 |  |  |  | 18 |  |  |  | 28.42 |
30.31 | - | 30.31 |  |  | 26 |  |  |  | 1.35 |  |  |  | 30.31 |  |  |  | 26 |  |  |  | 30.31 |
40.57 | - | 40.57 |  |  | 41 |  |  |  | 8.00 |  |  |  | 40.57 |  |  |  | 40 |  |  |  | 40.57 |
40.72 | - | 40.72 |  |  | 2 |  |  |  | 7.88 |  |  |  | 40.72 |  |  |  | 1 |  |  |  | 40.72 |
44.40 | - | 44.40 |  |  | 52 |  |  |  | 8.23 |  |  |  | 44.40 |  |  |  | 24 |  |  |  | 44.40 |
45.50 | - | 45.50 |  |  | 258 |  |  |  | 8.61 |  |  |  | 45.50 |  |  |  | 200 |  |  |  | 45.50 |
47.02 | - | 47.02 |  |  | 58 |  |  |  | 9.05 |  |  |  | 47.02 |  |  |  | -- |  |  |  | -- |
48.13 | - | 48.13 |  |  | 3 |  |  |  | 8.71 |  |  |  | 48.13 |  |  |  | 3 |  |  |  | 48.13 |
$17.55 | - | $48.13 |  |  | 473 |  |  |  | 7.72 |  |  | $ | 42.84 |  |  |  | 322 |  |  | $ | 41.82 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31, 2016 |  | Year Ended December 31, 2015
Expected dividend yield |  |  | 1.96 | % |  |  | 2.06 | %
Expected stock price volatility |  |  | 27.34 | % |  |  | 16.96 | %
Risk-free interest rate |  |  | 2.01 | % |  |  | 2.17 | %
Expected life of options |  |  | 7 years |  |  |  | 10 years |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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