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Note 13 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Expected option life in years(1) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Expected stock price volatility percentage(2) |  |  | 28 | % |  |  | 28 | % |  |  | 26 | %
Risk-free interest rate percentage(3) |  |  | 0.6 | % |  |  | 2.2 | % |  |  | 2.8 | %
Expected dividend yield(4) |  |  | 0.80 | % |  |  | 0.58 | % |  |  | 0.48 | %
Fair value as of the date of grant |  | $ | 3.85 |  |  | $ | 3.93 |  |  | $ | 4.13 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2019 |  |  | 1,263,513 |  |  | $ | 9.87 |
Granted |  |  | 41,500 |  |  |  | 15.37 |
Exercised |  |  | (580,933 | ) |  |  | 8.25 |
Forfeited |  |  | (12,300 | ) |  |  | 12.37 |
Outstanding at December 31, 2020 |  |  | 711,780 |  |  | $ | 11.47 |
Exercisable at December 31, 2020 |  |  | 379,218 |  |  | $ | 9.97 |
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, 2019 |  |  | 477,980 |  |  | $ | 3.45 |  |  |  | 5.1 |
Granted |  |  | 41,500 |  |  |  | 3.85 |  |  |  | 6.4 |
Vested |  |  | (175,818 | ) |  |  | 3.07 |  |  |  | 3.2 |
Forfeited |  |  | (11,100 | ) |  |  | 3.43 |  |  |  | 4.3 |
Nonvested at December 31, 2020 |  |  | 332,562 |  |  | $ | 3.71 |  |  |  | 4.8 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2019 |  |  | 207,179 |  |  |  | $ | 11.44 |
Granted |  |  | 73,205 |  |  |  |  | 16.44 |
Vested |  |  | (109,304 | )(1) |  |  |  | 11.79 |
Forfeited |  |  | (16,719 | ) |  |  |  | 7.49 |
Nonvested at December 31, 2020 |  |  | 154,361 |  |  |  | $ | 13.99 |

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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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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