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Note 2 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Noncurrent assets from discontinued operations $ 409 $ 1,025  
Contingent liabilities 1,635 4,100  
Transport Financial Services [Member]      
Discontinued Operation, Tax Effect of Discontinued Operation 200 200 $ 800
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]      
Operating expenses 0 0 25
(Reversal of) loss contingency (800) (1,000) (3,412)
Operating income 800 1,000 3,387
Income before income taxes 800 1,000 3,387
Discontinued Operation, Tax Effect of Discontinued Operation 200 250 847
Net income from discontinued operations, net of tax 600 750 $ 2,540
Noncurrent deferred tax asset 409 1,025  
Noncurrent assets from discontinued operations 409 1,025  
Total assets from discontinued operations 409 1,025  
Accounts payable 0 0  
Current liabilities of discontinued operations 0 0  
Total liabilities from discontinued operations $ 1,635 $ 4,100