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Note 13 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 307,260 |  |  | $ | 146,055 |  |  | $ | 188,174 |
Foreign |  |  | 6,423 |  |  |  | 5,668 |  |  |  | 1,349 |
Total |  |  | 313,683 |  |  |  | 151,723 |  |  |  | 189,523 |
Current provision |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 47,475 |  |  | $ | 67,988 |  |  | $ | 20,303 |
State |  |  | 10,759 |  |  |  | 6,706 |  |  |  | 4,648 |
Total |  |  | 58,234 |  |  |  | 74,694 |  |  |  | 24,951 |
Deferred provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 13,809 |  |  |  | (37,683 | ) |  |  | 20,925 |
State |  |  | (631 | ) |  |  | (1,254 | ) |  |  | 2,064 |
Foreign |  |  | 856 |  |  |  | 1,079 |  |  |  | − |
Total |  |  | 14,034 |  |  |  | (37,858 | ) |  |  | 22,989 |
Provision (benefit) for income taxes |  | $ | 72,268 |  |  | $ | 36,836 |  |  | $ | 47,940 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Income taxes at the federal statutory rate |  | $ | 65,694 |  |  | $ | 31,862 |  |  | $ | 39,530 |
State income taxes, net of federal benefit |  |  | 7,874 |  |  |  | 4,487 |  |  |  | 5,303 |
Tax effect of permanent differences |  |  | (2,502 | ) |  |  | 283 |  |  |  | 1,562 |
Foreign tax rate differential |  |  | (313 | ) |  |  | (111 | ) |  |  | − |
Other, net |  |  | 1,515 |  |  |  | 315 |  |  |  | 1,545 |
Provision (benefit) for income taxes |  | $ | 72,268 |  |  | $ | 36,836 |  |  | $ | 47,940 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Deferred income tax (assets) liabilities: |  |  |  |  |  |  |  |
Inventory |  | $ | (2,704 | ) |  | $ | (4,329 | )
Accounts receivable |  |  | (349 | ) |  |  | (168 | )
Finance lease obligations |  |  | (27,242 | ) |  |  | (27,522 | )
Finance and operating leases |  |  | (16,379 | ) |  |  | (13,607 | )
Stock options |  |  | (6,993 | ) |  |  | (7,463 | )
Accrued liabilities |  |  | (5,768 | ) |  |  | (7,680 | )
State net operating loss carry forward |  |  | (1,438 | ) |  |  | (1,101 | )
State tax credit |  |  | (120 | ) |  |  | (193 | )
Other |  |  | (2,765 | ) |  |  | (3,302 | )
Difference between book and tax basis- Operating lease assets |  |  | 16,132 |  |  |  | 13,444 |
Difference between book and tax basis- Depreciation and amortization |  |  | 188,099 |  |  |  | 178,360 |
Net deferred income tax liability |  | $ | 140,473 |  |  | $ | 126,439 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Unrecognized tax benefits at beginning of period |  | $ | 3,306 |  |  | $ | 3,007 |  |  | $ | 2,389 |
Gross increases – tax positions in current year |  |  | 1,512 |  |  |  | 651 |  |  |  | 1,188 |
Reductions due to lapse of statute of limitations |  |  | (509 | ) |  |  | (352 | ) |  |  | (570 | )
Unrecognized tax benefits at end of period |  | $ | 4,309 |  |  | $ | 3,306 |  |  | $ | 3,007 |

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