Note 19 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 714,646,000	$ 810,807,000	$ 946,862,000
Related Party [Member]
Revenue from Contract with Customer, Including Assessed Tax	13,319,000	321,000	1,363,000
Operating Expenses	30,140,000	27,286,000	21,438,000
Accounts Receivable, after Allowance for Credit Loss	3,724,000	1,809,000
Accounts Payable	1,196,000	1,101,000
Related Party [Member] \| Freight Transportation [Member]
Accounts Receivable, after Allowance for Credit Loss	3,275,000	1,418,000
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	449,000	391,000
Related Party [Member] \| Auto Liability Coverage [Member]
Selling, General and Administrative Expense	14,404,000	13,307,000	11,437,000
Related Party [Member] \| Workers Compensation Coverage [Member]
Selling, General and Administrative Expense	$ 267,000	$ 298,000	$ 338,000

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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