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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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