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Note 8 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Stock Options |  |  | Weighted-Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Outstanding as of December 31, 2021 |  |  | 23,766 |  |  | $ | 9.94 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (15,086 | ) |  |  | 8.21 |  |  |  |  |  |  |  |  |
Forfeited/cancelled/expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding as of September 30, 2022 |  |  | 8,680 |  |  |  | 12.95 |  |  |  | 0.54 |  |  | $ | 87,691 |
Exercisable as of September 30, 2022 |  |  | 8,680 |  |  | $ | 12.95 |  |  |  | - |  |  | $ | - |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | Nonvested Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested as of December 31, 2021 |  |  | 82,693 |  |  | $ | 21.78 |
Granted |  |  | 53,543 |  |  |  | 30.76 |
Vested |  |  | (42,815 | ) |  |  | 25.00 |
Forfeited/cancelled/expired |  |  | (374 | ) |  |  | 30.99 |
Nonvested as of September 30, 2022 |  |  | 93,047 |  |  | $ | 25.43 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] |
|  | Units (expected) |  |  | Units (maximum) |  |  | Weighted Average Grant Date Fair Value |
Unearned as of December 31, 2021 |  |  | 209,995 |  |  |  |  |  |  | $ | 16.18 |
Awarded |  |  | 34,874 |  |  |  |  |  |  |  | 32.80 |
Vested shares |  |  | (49,604 | ) |  |  |  |  |  |  | 20.79 |
Unearned as of September 30, 2022 |  |  | 195,265 |  |  |  | 221,541 |  |  | $ | 17.98 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Units (expected) |  |  | Weighted Average Grant Date Fair Value |
Unearned as of December 31, 2021 |  |  | 136,948 |  |  | $ | 16.52 |
Awarded |  |  | 52,312 |  |  |  | 32.80 |
Vested shares |  |  | (69,225 | ) |  |  | 16.13 |
Unearned as of September 30, 2022 |  |  | 120,035 |  |  | $ | 23.84 |

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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