Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gain (Loss) on Disposition of Property Plant Equipment	$ 602		$ 38,721	$ 12,380	$ 39,287
Tractors [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years			5 years
Tractors [Member] | Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage	10.00%			10.00%
Tractors [Member] | Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage	35.00%			35.00%
Refrigerated Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years			7 years
Dry Van Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years			10 years
Dry Van Trailers [Member] | Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage	28.00%			28.00%
Dry Van Trailers [Member] | Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage	29.00%			29.00%
Terminal Property [Member] | CALIFORNIA
Gain (Loss) on Disposition of Property Plant Equipment		$ 7,600