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Note 3 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | average |
|  |  |  |  |  | Exercise Price |
|  | Shares |  |  | Per Share |
Outstanding, January 1, 2019 |  |  | 7,450 |  |  | $ | 17.55 |
Exercised |  |  | (200 | ) |  |  | 17.55 |
Outstanding, September 30, 2019 |  |  | 7,250 |  |  | $ | 17.55 |
Exercisable, September 30, 2019 |  |  | 7,250 |  |  | $ | 17.55 |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | average |
|  |  |  |  |  | Grant Date Fair |
|  | Units |  |  | Value Per Unit |
Nonvested at January 1, 2019 |  |  | 21,175 |  |  | $ | 41.95 |
Granted |  |  | 14,565 |  |  |  | 41.90 |
Vested |  |  | (4,970 | ) |  |  | 32.40 |
Nonvested at September 30, 2019 |  |  | 30,770 |  |  | $ | 43.48 |
Expected to vest as of September 30, 2019 |  |  | 6,253 |  |  | $ | 39.58 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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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