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Note 3 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | average |
|  | Shares |  |  | Exercise Price |
|  | 2018 |  |  | Per Share |
Outstanding, January 1 |  |  | 19,750 |  |  | $ | 20.94 |
Exercised |  |  | (6,000 | ) |  |  | 23.00 |
Outstanding, June 30 |  |  | 13,750 |  |  | $ | 20.05 |
Exercisable, June 30 |  |  | 13,750 |  |  | $ | 20.05 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | average |
|  |  |  |  |  | Grant Date Fair |
|  | Shares |  |  | Value Per Share |
Nonvested at January 1, 2018 |  |  | 14,601 |  |  | $ | 35.14 |
Granted |  |  | 9,952 |  |  |  | 48.20 |
Forfeited |  |  | (223 | ) |  |  | 35.31 |
Vested |  |  | (3,905 | ) |  |  | 33.61 |
Nonvested at June 30, 2018 |  |  | 20,425 |  |  | $ | 41.80 |
Expected to vest at June 30, 2018 |  |  | 10,473 |  |  | $ | 35.71 |

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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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