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Note 11 - Stock Awards (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2018 |  |  | 2017 |
Risk-free interest rate |  |  | 2.77 | % |  |  | 2.23 | %
Expected term (in years) |  |  | 7.5 |  |  |  | 7.5 |
Expected stock price volatility |  |  | 28.3 | % |  |  | 25.4 | %
Dividend yield |  |  | 1.50 | % |  |  | 1.50 | %
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Three Months Ended |
|  | March 31 , 2018 |  |  | March 31 , 2017 |
|  | Number of Shares |  |  | Average Exercise Price |  |  | Number of Shares |  |  | Average Exercise Price |
Options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, beginning of period |  |  | 318,000 |  |  | $ | 9.43 |  |  |  | 272,550 |  |  | $ | 8.21 |
Granted |  |  | 62,150 |  |  |  | 11.71 |  |  |  | 64,600 |  |  |  | 14.11 |
Exercised |  |  | — |  |  |  | — |  |  |  | 16,650 |  |  |  | 8.15 |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | 450 |  |  |  | 11.71 |  |  |  | — |  |  |  | — |
Options outstanding, end of period |  |  | 379,700 |  |  | $ | 9.80 |  |  |  | 320,500 |  |  | $ | 9.41 |
Options exercisable, end of period |  |  | 248,300 |  |  | $ | 8.71 |  |  |  | 210,633 |  |  | $ | 8.20 |

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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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