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Note 8 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Stock-based compensation expense, gross |  | $ | 22 |  |  | $ | 14 |  |  | $ | 16 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (6 | ) |  |  | (4 | ) |  |  | (4 | )
Stock-based compensation expense, net |  | $ | 16 |  |  | $ | 10 |  |  | $ | 12 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |
|  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |
Restricted stock - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 1,035,728 |  |  | $ | 19.69 |  |  |  | 917,533 |  |  | $ | 16.84 |  |  |  | 977,547 |  |  | $ | 15.45 |
Granted |  |  | 400,927 |  |  |  | 21.68 |  |  |  | 731,374 |  |  |  | 19.73 |  |  |  | 359,481 |  |  |  | 18.92 |
Vested |  |  | (438,910 | ) |  |  | 19.38 |  |  |  | (613,179 | ) |  |  | 15.48 |  |  |  | (333,865 | ) |  |  | 15.35 |
Forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (85,630 | ) |  |  | 15.53 |
Outstanding - end of period |  |  | 997,745 |  |  | $ | 20.62 |  |  |  | 1,035,728 |  |  | $ | 19.69 |  |  |  | 917,533 |  |  | $ | 16.84 |
Restricted stock - Class A common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 720,421 |  |  | $ | 18.22 |  |  |  | 480,042 |  |  | $ | 16.10 |  |  |  | 449,284 |  |  | $ | 13.55 |
Granted |  |  | 250,448 |  |  |  | 20.52 |  |  |  | 488,918 |  |  |  | 18.66 |  |  |  | 166,814 |  |  |  | 19.87 |
Vested |  |  | (293,631 | ) |  |  | 17.55 |  |  |  | (248,539 | ) |  |  | 15.00 |  |  |  | (136,056 | ) |  |  | 12.32 |
Outstanding - end of period |  |  | 677,238 |  |  | $ | 19.36 |  |  |  | 720,421 |  |  | $ | 18.22 |  |  |  | 480,042 |  |  | $ | 16.10 |
Restricted stock units - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 125,247 |  |  | $ | 19.02 |  |  |  | 90,184 |  |  | $ | 18.92 |  |  |  | 398,000 |  |  | $ | 18.21 |
Granted |  |  | 259,079 |  |  |  | 23.87 |  |  |  | 95,115 |  |  |  | 19.05 |  |  |  | 93,184 |  |  |  | 18.77 |
Vested |  |  | (108,921 | ) |  |  | 19.03 |  |  |  | (60,052 | ) |  |  | 18.92 |  |  |  | (374,500 | ) |  |  | 18.18 |
Forfeited |  |  | (1,260 | ) |  |  | 19.05 |  |  |  | - |  |  |  | - |  |  |  | (26,500 | ) |  |  | 18.21 |
Outstanding - end of period |  |  | 274,145 |  |  | $ | 23.60 |  |  |  | 125,247 |  |  | $ | 19.02 |  |  |  | 90,184 |  |  | $ | 18.92 |

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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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