Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Reversal of contingent loss liability	$ (200)	$ 0	$ (400)	$ 0
Income from discontinued operations, net of tax	150	0	300	0
Noncurrent assets from discontinued operations	925		925		$ 1,025
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income before income taxes	200	0	400	0
Income tax expense	50	$ 0	100	$ 0
Noncurrent deferred tax asset	925		925		1,025
Noncurrent assets from discontinued operations	925		925		1,025
Total assets from discontinued operations	925		925		1,025
Long-term contingent loss liability	3,700		3,700		4,100
Long-term liabilities of discontinued operations	3,700		3,700		4,100
Total liabilities from discontinued operations	$ 3,700		$ 3,700		$ 4,100