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Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Gain on reversal of contingent loss of discontinued operations     $ 0 $ (700)  
Income from discontinued operations, net of tax $ 150 $ 0 450 0  
Noncurrent assets from discontinued operations 459   459   $ 1,025
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]          
Gain on reversal of contingent loss of discontinued operations (200) 0 (600) 0  
Income before income taxes 200 0 600 0  
Income tax expense 50 $ 0 150 $ 0  
Noncurrent deferred tax asset 459   459   1,025
Noncurrent assets from discontinued operations 459   459   1,025
Total assets from discontinued operations 459   459   1,025
Long-term contingent loss liability 1,835   1,835   4,100
Long-term liabilities of discontinued operations 1,835   1,835   4,100
Total liabilities from discontinued operations $ 1,835   $ 1,835   $ 4,100