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Note 7 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
Stock-based compensation expense, gross |  | $ | 5 |  |  | $ | 4 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (1 | ) |  |  | (1 | )
Stock-based compensation expense, net |  | $ | 4 |  |  | $ | 3 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |
|  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |
Restricted common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 1,035,728 |  |  | $ | 19.69 |  |  |  | 917,533 |  |  | $ | 16.84 |
Granted (1) |  |  | 333,382 |  |  |  | 22.16 |  |  |  | 296,042 |  |  |  | 18.21 |
Vested |  |  | (294,558 | ) |  |  | 18.56 |  |  |  | (502,241 | ) |  |  | 16.10 |
Outstanding - end of period |  |  | 1,074,552 |  |  | $ | 20.76 |  |  |  | 711,334 |  |  | $ | 17.94 |
Restricted Class A common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 720,421 |  |  | $ | 18.22 |  |  |  | 480,042 |  |  | $ | 16.10 |
Granted (1) |  |  | 250,448 |  |  |  | 20.52 |  |  |  | 233,425 |  |  |  | 17.67 |
Vested |  |  | (229,758 | ) |  |  | 16.99 |  |  |  | (248,539 | ) |  |  | 15.00 |
Outstanding - end of period |  |  | 741,111 |  |  | $ | 19.38 |  |  |  | 464,928 |  |  | $ | 17.47 |
Restricted stock units - common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 125,247 |  |  | $ | 19.02 |  |  |  | 90,184 |  |  | $ | 18.92 |
Granted |  |  | 259,079 |  |  |  | 23.87 |  |  |  | 95,115 |  |  |  | 19.05 |
Vested |  |  | (108,921 | ) |  |  | 19.03 |  |  |  | (60,052 | ) |  |  | 18.92 |
Forfeited |  |  | (1,260 | ) |  |  | 19.05 |  |  |  | - |  |  |  | - |
Outstanding - end of period |  |  | 274,145 |  |  | $ | 23.60 |  |  |  | 125,247 |  |  | $ | 19.02 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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