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Note 19 - Related Party Transactions (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 01, 2019
Self Insurance Auto Liability Claims Threshold Amount |  |  |  | $ 1,000,000
Auto Liability Coverage [Member] |  |  |  |
Self Insurance Auto Liability Claims Threshold Amount | $ 1,000,000 |  |  | $ 1,000,000
Majority Shareholder [Member] |  |  |  |
Revenue from Related Parties | 2,691,000 | $ 2,854,000 | $ 585,000 |
Related Party Transaction, Expenses from Transactions with Related Party | 9,190,000 | 9,859,000 | 7,497,000 |
Due from Related Parties, Total | 1,052,000 | 149,000 |  |
Due to Related Parties, Total | 961,000 | 2,161,000 |  |
Majority Shareholder [Member] | Freight Transportation [Member] |  |  |  |
Accounts Receivable, Related Parties | 1,052,000 | 147,000 |  |
Majority Shareholder [Member] | Maintenance Performed and Charges Paid to Third Parties on Behalf of Their Affiliate and Charged Back [Member] |  |  |  |
Accounts Receivable, Related Parties | 0 | 2,000 |  |
Majority Shareholder [Member] | Insurance Premiums Paid in Excess of Amounts Earned [Member] |  |  |  |
Accounts Receivable, Related Parties | 0 | 29,000 |  |
Majority Shareholder [Member] | Physical Damage Coverage [Member] |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 0 | 1,271,000 | 1,808,000 |
Majority Shareholder [Member] | Auto Liability Coverage [Member] |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 10,345,000 | 10,987,000 | 10,860,000 |
Majority Shareholder [Member] | General Liability Coverage [Member] |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 0 | 24,000 | 35,000 |
Majority Shareholder [Member] | Workers Compensation Coverage [Member] |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | $ 266,000 | $ 301,000 | $ 286,000 |

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