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Note 2 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Noncurrent assets from discontinued operations   $ 1,275 $ 9,535
Current liabilities of discontinued operations   0 816
Disposal Group, Including Discontinued Operation, Contingent Liabilities   5,100 44,151
Freight revenue   1,046,003 838,561
Income (loss) from continuing operations   $ 58,191 $ (14,120)
Income (loss) from continuing operations (in dollars per share)   $ 3.46 $ (0.81)
Income (loss) from continuing operations (in dollars per share)   $ 3.42 $ (0.81)
Transport Financial Services [Member]      
Discontinued Operation, Tax Effect of Discontinued Operation, Total   $ 800 $ 9,500
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]      
Total revenue   0 5,397
Operating expenses   25 1,149
Gain on disposal   0 (3,720)
(Reversal of) loss contingency $ (3,400) (3,412) 44,151
Operating income (loss)   3,387 (36,183)
Interest expense   0 1,950
Income (loss) before income taxes   3,387 (38,133)
Discontinued Operation, Tax Effect of Discontinued Operation, Total   847 (9,535)
Net income (loss) from discontinued operations, net of tax   2,540 (28,598)
Noncurrent deferred tax asset   1,275 9,535
Noncurrent assets from discontinued operations   1,275 9,535
Total assets from discontinued operations   1,275 9,535
Accounts payable   0 816
Current liabilities of discontinued operations   0 816
Total liabilities from discontinued operations   5,100 44,967
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Pro Forma [Member]      
Freight revenue   1,046,003 838,561
Income (loss) from continuing operations   $ 58,191 $ (14,120)
Income (loss) from continuing operations (in dollars per share)   $ 3.46 $ (0.81)
Income (loss) from continuing operations (in dollars per share)   $ 3.42 $ (0.81)