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Note 2 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Noncurrent assets from discontinued operations   $ 1,025 $ 1,275
Disposal Group, Including Discontinued Operation, Contingent Liabilities   4,100 5,100
Transport Financial Services [Member]      
Discontinued Operation, Tax Effect of Discontinued Operation   200 800
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]      
Operating expenses   0 25
(Reversal of) loss contingency $ (3,400) (1,000) (3,412)
Operating income   1,000 3,387
Income before income taxes   1,000 3,387
Discontinued Operation, Tax Effect of Discontinued Operation   250 847
Net income from discontinued operations, net of tax   750 2,540
Noncurrent deferred tax asset   1,025 1,275
Noncurrent assets from discontinued operations   1,025 1,275
Total assets from discontinued operations   1,025 1,275
Accounts payable   0 0
Current liabilities of discontinued operations   0 0
Total liabilities from discontinued operations   $ 4,100 $ 5,100