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Note 11 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block Supplement [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 20 14 |  |  | 2013 |  |  | 2012 |
Expected option life in years(1) |  |  | 6.0 |  |  |  | 6.1 |  |  |  | 6.1 |
Expected stock price volatility percentage(2) |  |  | 27 | % |  |  | 33 | % |  |  | 37 | %
Risk-free interest rate percentage(3) |  |  | 1.9 | % |  |  | 1.5 | % |  |  | 1.1 | %
Expected dividend yield(4) |  |  | 0.46 | % |  |  | 0.51 | % |  |  | 0.49 | %
Fair value as of the date of grant |  | $ | 6.25 |  |  | $ | 5.46 |  |  | $ | 4.81 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Shares |  |  | Exercise Price |
Outstanding at December 31, 2013 |  |  | 1,015,759 |  |  | $ | 14.07 |
Granted |  |  | 76,000 |  |  |  | 21.99 |
Exercised |  |  | (89,192 | ) |  |  | 13.61 |
Forfeited |  |  | (24,700 | ) |  |  | 13.85 |
Outstanding at December 31, 2014 |  |  | 977,867 |  |  | $ | 14.74 |
Exercisable at December 31, 2014 |  |  | 695,317 |  |  | $ | 13.63 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  |  | Average |
|  |  |  |  |  | Weighted |  |  | Remaining |
|  |  |  |  |  | Average |  |  | Contractual |
|  |  |  |  |  | Grant Date |  |  | Life |
|  | Shares |  |  | Fair Value |  |  | (in Years) |
Service-based options: |  |  |  |  |  |  |  |  |  |  |  |
Nonvested at December 31, 2013 |  |  | 331,450 |  |  | $ | 5.30 |  |  |  | 5.5 |
Granted |  |  | 76,000 |  |  |  | 6.25 |  |  |  | 6.4 |
Vested |  |  | (101,100 | ) |  |  | 5.36 |  |  |  | 3.8 |
Forfeited |  |  | (23,800 | ) |  |  | 4.57 |  |  |  | 4.8 |
Nonvested at December 31, 2014 |  |  | 282,550 |  |  | $ | 5.60 |  |  |  | 5.3 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Nonvested at December 31, 2013 |  |  | 117,532 |  |  | $ | 13.81 |
Granted |  |  | 47,400 |  |  |  | 22.34 |
Vested |  |  | (14,415 | ) (1) |  |  | 15.10 |
Nonvested at December 31, 2014 |  |  | 150,517 |  |  | $ | 16.37 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested 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 (c)(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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