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Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 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
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]      
Total revenue 0 0  
Operating expenses 0 0  
Operating income 0 0  
Gain on reversal of contingent loss of discontinued operations 0 (3,412)  
Interest expense 0 0  
Income before income taxes 0 3,412  
Income tax expense 0 853  
Income from discontinued operations, net of tax 0 $ 2,559  
Noncurrent deferred tax asset 1,275   1,275
Noncurrent assets from discontinued operations 1,275   1,275
Total assets from discontinued operations 1,275   1,275
Long-term contingent loss liability 5,100   5,100
Long-term liabilities of discontinued operations 5,100   5,100
Total liabilities from discontinued operations $ 5,100   $ 5,100