Note 11 - Equity Method Investment - TEL's Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Operating lease obligations	$ 14,596		$ 14,596		$ 18,179
Total Assets	892,158		892,158		796,645
Total Liabilities	498,135		498,135		419,517
Transport Enterprise Leasing LLC [Member]
Total Assets	614,865		614,865		480,724
Total Liabilities	498,659		498,659		377,548
Total Equity	116,206		116,206		103,177
Revenue	36,780	$ 40,135	114,050	$ 106,231
Cost of Sales	2,343	9,237	12,672	19,355
Operating Expenses	17,517	14,047	46,485	38,074
Operating Income	16,920	16,851	54,893	48,802
Net Income	10,710	$ 14,901	33,029	$ 43,287
Transport Enterprise Leasing LLC [Member] | Driver Advances and Other Receivable [Member]
Accounts receivable from TEL	24		24		9
Transport Enterprise Leasing LLC [Member] | Accrued Expenses [Member]
Accounts payable to TEL	378		378		763
Transport Enterprise Leasing LLC [Member] | Other Assets [Member]
Investment in TEL	61,586		61,586		54,727
Transport Enterprise Leasing LLC [Member] | Operating Lease Liability, Current [Member]
Operating lease obligations	$ 9,678		$ 9,678		$ 13,825