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Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Gain on reversal of contingent loss of discontinued operations       $ 0 $ (3,412)  
Noncurrent assets from discontinued operations $ 1,275     1,275   $ 1,275
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]            
Total revenue 0 $ 0   0 0  
Operating expenses 0 25   0 25  
Operating income 0 (25)   0 (25)  
Gain on reversal of contingent loss of discontinued operations 0 0 $ (3,400) 0 (3,412)  
Interest expense 0 0   0 0  
Income before income taxes 0 (25)   0 3,387  
Income tax expense 0 (6)   0 847  
Income from discontinued operations, net of tax 0 $ (19)   0 $ 2,540  
Noncurrent deferred tax asset 1,275     1,275   1,275
Noncurrent assets from discontinued operations 1,275     1,275   1,275
Total assets from discontinued operations 1,275     1,275   1,275
Long-term contingent loss liability 5,100     5,100   5,100
Long-term liabilities of discontinued operations 5,100     5,100   5,100
Total liabilities from discontinued operations $ 5,100     $ 5,100   $ 5,100