Note 4 - Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Noncurrent assets from discontinued operations	$ 359		$ 409
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Reversal of contingent loss liability	(200)	$ (200)
Income before income taxes	200	200
Income tax expense	50	50
Income from discontinued operations, net of tax	150	$ 150
Noncurrent deferred tax asset	359		409
Noncurrent assets from discontinued operations	359		409
Total assets from discontinued operations	359		409
Long-term contingent loss liability	1,435		1,635
Long-term liabilities of discontinued operations	1,435		1,635
Total liabilities from discontinued operations	$ 1,435		$ 1,635