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Note 14 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 9 |  |  | 2018 |  |  | 2017 |
Expected option life in years(1) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Expected stock price volatility percentage(2) |  |  | 28 | % |  |  | 26 | % |  |  | 25 | %
Risk-free interest rate percentage(3) |  |  | 2.2 | % |  |  | 2.8 | % |  |  | 2.0 | %
Expected dividend yield(4) |  |  | 0.58 | % |  |  | 0.48 | % |  |  | 0.59 | %
Fair value as of the date of grant |  | $ | 5.89 |  |  | $ | 6.19 |  |  | $ | 4.34 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2018 |  |  | 939,193 |  |  | $ | 13.78 |
Granted |  |  | 68,000 |  |  |  | 20.00 |
Exercised |  |  | (151,594 | ) |  |  | 10.68 |
Forfeited |  |  | (13,270 | ) |  |  | 15.73 |
Outstanding at December 31, 2019 |  |  | 842,329 |  |  | $ | 14.81 |
Exercisable at December 31, 2019 |  |  | 523,677 |  |  | $ | 12.69 |
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, 2018 |  |  | 393,480 |  |  | $ | 4.72 |  |  |  | 5.2 |
Granted |  |  | 68,000 |  |  |  | 5.89 |  |  |  | 6.5 |
Vested |  |  | (132,558 | ) |  |  | 4.29 |  |  |  | 3.5 |
Forfeited |  |  | (10,270 | ) |  |  | 4.37 |  |  |  | 3.6 |
Nonvested at December 31, 2019 |  |  | 318,652 |  |  | $ | 5.18 |  |  |  | 5.1 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2018 |  |  | 185,909 |  |  | $ | 14.89 |
Granted |  |  | 70,000 |  |  |  | 19.89 |
Vested |  |  | (78,305 | )(1) |  |  | 15.88 |
Forfeited |  |  | (39,487 | ) |  |  | 14.33 |
Nonvested at December 31, 2019 |  |  | 138,117 |  |  | $ | 17.16 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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