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Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Noncurrent assets from discontinued operations $ 308   $ 308   $ 409
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]          
Reversal of contingent loss liability (200) $ (200) (400) $ (400)  
Income before income taxes 200 200 400 400  
Income tax expense 50 50 100 100  
Income from discontinued operations, net of tax 150 $ 150 300 $ 300  
Noncurrent deferred tax asset 308   308   409
Noncurrent assets from discontinued operations 308   308   409
Total assets from discontinued operations 308   308   409
Long-term contingent loss liability 1,235   1,235   1,635
Long-term liabilities of discontinued operations 1,235   1,235   1,635
Total liabilities from discontinued operations $ 1,235   $ 1,235   $ 1,635