Note 11 - Equity Method Investment - TEL's Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Operating lease obligations	$ 15,265		$ 15,265		$ 15,811
Total Assets	701,018		701,018		651,662
Total Liabilities	344,987		344,987		301,963
Transport Enterprise Leasing LLC [Member]
Total Assets	391,952		391,952		346,218
Total Liabilities	283,296		283,296		264,948
Total Equity	108,656		108,656		81,270
Revenue	33,857	$ 25,534	66,096	$ 48,438
Cost of Sales	5,645	2,091	10,118	3,233
Operating Expenses	11,754	15,036	24,028	28,942
Operating Income	16,458	8,407	31,950	16,263
Net Income	14,728	$ 6,615	28,386	$ 12,619
Transport Enterprise Leasing LLC [Member] | Driver Advances and Other Receivable [Member]
Accounts receivable from TEL	80		80		802
Transport Enterprise Leasing LLC [Member] | Other Assets [Member]
Investment in TEL	58,088		58,088		44,196
Transport Enterprise Leasing LLC [Member] | Operating Lease Liability, Current [Member]
Operating lease obligations	$ 1,442		$ 1,442		$ 0