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Note 12 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Expected option life in years (1) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Expected stock price volatility percentage (2) |  |  | 25 | % |  |  | 25 | % |  |  | 25 | %
Risk-free interest rate percentage (3) |  |  | 2.0 | % |  |  | 1.4 | % |  |  | 1.8 | %
Expected dividend yield (4) |  |  | 0.59 | % |  |  | 0.50 | % |  |  | 0.44 | %
Fair value as of the date of grant |  | $ | 4.34 |  |  | $ | 3.17 |  |  | $ | 3.58 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 201 6 |  |  | 922,934 |  |  | $ | 10.94 |
Granted |  |  | 136,501 |  |  |  | 16.32 |
Exercised |  |  | (124,016 | ) |  |  | 8.83 |
Forfeited |  |  | (16,836 | ) |  |  | 11.43 |
Outstanding at December 31, 201 7 |  |  | 918,583 |  |  | $ | 12.02 |
Exercisable at December 31, 2017 |  |  | 505,355 |  |  | $ | 10.42 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Weighted Average Remaining Contractual Life (in Years) |
Nonvested at December 31, 201 6 |  |  | 444,476 |  |  | $ | 3.46 |  |  |  | 5.0 |
Granted |  |  | 136,501 |  |  |  | 4.34 |  |  |  | 6.7 |
Vested |  |  | (151,912 | ) |  |  | 3.39 |  |  |  | 3.4 |
Forfeited |  |  | (15,837 | ) |  |  | 3.19 |  |  |  | 4.3 |
Nonvested at December 31, 201 7 |  |  | 413,228 |  |  | $ | 3.79 |  |  |  | 5.1 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 201 6 |  |  | 253,028 |  |  | $ | 11.66 |
Granted |  |  | 154,511 |  |  |  | 14.48 |
Vested |  |  | (37,648 | )(1) |  |  | 12.86 |
Forfeited |  |  | (47,229 | ) |  |  | 8.58 |
Nonvested at December 31, 201 7 |  |  | 322,662 |  |  | $ | 13.32 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -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 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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