Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Gain on reversal of contingent loss of discontinued operations				$ (700)	$ (3,412)
Noncurrent assets from discontinued operations	$ 1,100			1,100		$ 1,275
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Total revenue	0	$ 0		0	0
Operating expenses	0	0		0	(25)
Operating loss	0	0		0	(25)
Gain on reversal of contingent loss of discontinued operations	(700)	0	$ (3,400)	(700)	(3,412)
Interest expense	0	0		0	0
Income (loss) before income taxes	700	0		700	3,387
Income tax expense (benefit)	175	0		175	847
Income (loss) from discontinued operations, net of tax	525	$ 0		525	$ 2,540
Noncurrent deferred tax asset	1,100			1,100		1,275
Noncurrent assets from discontinued operations	1,100			1,100		1,275
Total assets from discontinued operations	1,100			1,100		1,275
Long-term contingent loss liability	4,400			4,400		5,100
Long-term liabilities of discontinued operations	4,400			4,400		5,100
Total liabilities from discontinued operations	$ 4,400			$ 4,400		$ 5,100