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Note 3 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted- average Exercise |
|  | Shares |  |  | Price Per Share |
Outstanding, January 1, 2021 |  |  | 12,150 |  |  | $ | 8.78 |
Exercised |  |  | (12,150 | ) |  |  | 8.78 |
Outstanding, September 30, 2021 |  |  | - |  |  |  | - |
Exercisable, September 30, 2021 |  |  | - |  |  |  | - |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted-average Grant Date |
|  | Units |  |  | Fair Value Per Unit |
Nonvested at January 1, 2021 |  |  | 66,362 |  |  | $ | 23.52 |
Granted |  |  | 29,193 |  |  |  | 22.50 |
Vested |  |  | (17,622 | ) |  |  | (24.10 | )
Nonvested at September 30, 2021 |  |  | 77,933 |  |  | $ | 23.00 |
Expected to vest as of September 30, 2021 |  |  | 53,915 |  |  | $ | 22.42 |

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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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