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Note 6 - Stock-based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  | Number |  |  | Average |
|  | of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Nonvested at January 1, 2021 |  |  | 32,650 |  |  | $ | 53.93 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | 8,350 |  |  | $ | 51.00 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at September 30, 2021 |  |  | 24,300 |  |  | $ | 54.94 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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