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Note 13 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 455,288 |  |  | $ | 502,141 |  |  | $ | 307,260 |
Foreign |  |  | 6,773 |  |  |  | 7,186 |  |  |  | 6,423 |
Total |  |  | 462,061 |  |  |  | 509,327 |  |  |  | 313,683 |
Current provision |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 87,270 |  |  | $ | 93,942 |  |  | $ | 47,475 |
State |  |  | 16,864 |  |  |  | 16,516 |  |  |  | 10,759 |
Foreign |  |  | 2,265 |  |  |  | 2,523 |  |  |  | - |
Total |  |  | 106,399 |  |  |  | 112,981 |  |  |  | 58,234 |
Deferred provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 7,617 |  |  |  | 7,975 |  |  |  | 13,809 |
State |  |  | 505 |  |  |  | (565 | ) |  |  | (631 | )
Foreign |  |  | (521 | ) |  |  | (3,149 | ) |  |  | 856 |
Total |  |  | 7,601 |  |  |  | 4,261 |  |  |  | 14,034 |
Provision for income taxes |  | $ | 114,000 |  |  | $ | 117,242 |  |  | $ | 72,268 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | Amount |  |  | Rate |  |  | Amount |  |  | Rate |  |  | Amount |  |  | Rate |
Income taxes at the federal statutory rate |  | $ | 97,032 |  |  |  | 21.0 | % |  | $ | 106,959 |  |  |  | 21.0 | % |  | $ | 65,694 |  |  |  | 21.0 | %
State income taxes, net of federal benefit (a) |  |  | 14,120 |  |  |  | 3.1 |  |  |  | 12,708 |  |  |  | 2.5 |  |  |  | 7,874 |  |  |  | 2.5 |
Tax effect of permanent differences |  |  | 1,357 |  |  |  | 0.3 |  |  |  | (488 | ) |  |  | (0.1 | ) |  |  | (2502 | ) |  |  | (0.8 | )
Foreign tax rate differential |  |  | 266 |  |  |  | 0.0 |  |  |  | (2134 | ) |  |  | (0.4 | ) |  |  | (313 | ) |  |  | (0.1 | )
Other, net |  |  | 1,225 |  |  |  | 0.3 |  |  |  | 197 |  |  |  | 0.0 |  |  |  | 1,515 |  |  |  | 0.5 |
Provision for income taxes |  | $ | 114,000 |  |  |  | 24.7 | % |  | $ | 117,242 |  |  |  | 23.0 | % |  | $ | 72,268 |  |  |  | 23.1 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2023 |  |  | 2022 |
Deferred income tax (assets) liabilities: |  |  |  |  |  |  |  |
Inventory |  | $ | (5,215 | ) |  | $ | (4,710 | )
Accounts receivable |  |  | (436 | ) |  |  | (430 | )
Vehicle finance lease obligations |  |  | (31,178 | ) |  |  | (28,514 | )
Finance and operating leases - Liability |  |  | (29,446 | ) |  |  | (25,283 | )
Stock options |  |  | (8,785 | ) |  |  | (7,525 | )
Accrued liabilities |  |  | (4,653 | ) |  |  | (3,632 | )
State net operating loss carry forward |  |  | (1,111 | ) |  |  | (1,268 | )
State tax credit |  |  | (34 | ) |  |  | (77 | )
Other |  |  | (6,167 | ) |  |  | (5,519 | )
Finance and operating leases - Asset |  |  | 29,031 |  |  |  | 24,989 |
Fixed assets and intangibles |  |  | 217,565 |  |  |  | 203,939 |
Net deferred income tax liability |  | $ | 159,571 |  |  | $ | 151,970 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Unrecognized tax benefits at beginning of period |  | $ | 5,377 |  |  | $ | 4,309 |  |  | $ | 3,306 |
Gross increases – tax positions in current year |  |  | 2,582 |  |  |  | 2,025 |  |  |  | 1,512 |
Reductions due to lapse of statute of limitations |  |  | (1,188 | ) |  |  | (957 | ) |  |  | (509 | )
Unrecognized tax benefits at end of period |  | $ | 6,771 |  |  | $ | 5,377 |  |  | $ | 4,309 |

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