Note 19 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Revenue	$ 810,807,000	$ 946,862,000	$ 707,120,000
Related Party [Member]
Operating Revenue	8,321,000	1,363,000	8,085,000
Operating Expenses	27,286,000	21,438,000	11,103,000
Accounts Receivable, after Allowance for Credit Loss	1,809,000	723,000
Accounts Payable	1,101,000	1,290,000
Related Party [Member] \| Freight Transportation [Member]
Accounts Receivable, after Allowance for Credit Loss	1,418,000	382,000
Related Party [Member] \| Maintenance Performed and Charges Paid to Third Parties on Behalf of Their Affiliate and Charged Back [Member]
Accounts Receivable, after Allowance for Credit Loss	391,000	341,000
Related Party [Member] \| Auto Liability Coverage [Member]
Selling, General and Administrative Expense	13,307,000	11,437,000	9,851,000
Related Party [Member] \| Workers Compensation Coverage [Member]
Selling, General and Administrative Expense	$ 298,000	$ 338,000	$ 300,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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