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Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Reversal of contingent loss liability $ (200) $ 0  
Income from discontinued operations, net of tax 150 0  
Noncurrent assets from discontinued operations 975   $ 1,025
Long-term contingent loss liability 3,900 4,100  
Long-term liabilities of discontinued operations 3,900 4,100  
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]      
Income before income taxes 200 0  
Income tax expense 50 0  
Noncurrent deferred tax asset 975 1,025  
Noncurrent assets from discontinued operations 975 1,025  
Total assets from discontinued operations 975 1,025  
Total liabilities from discontinued operations $ 3,900 $ 4,100