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Note 20 - Related Party Transactions (Details Textual) - Majority Shareholder [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from Related Parties | $ 2,854,000 | $ 585,000 | $ 4,834,000
Related Party Transaction, Expenses from Transactions with Related Party | 9,859,000 | 7,497,000 | 8,837,000
Due from Related Parties, Total | 149,000 | 21,000 |
Due to Related Parties, Total | 2,161,000 | 971,000 |
Freight Transportation [Member] |  |  |
Accounts Receivable, Related Parties | 147,000 | 19,000 |
Maintenance Performed and Charges Paid to Third Parties on Behalf of Their Affiliate and Charged Back [Member] |  |  |
Accounts Receivable, Related Parties | 2,000 | 2,000 |
Insurance Premiums Paid in Excess of Amounts Earned [Member] |  |  |
Accounts Receivable, Related Parties | 29,000 | 1,385,000 |
Physical Damage Coverage [Member] |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 1,271,000 | 1,808,000 | 2,091,000
Auto Liability Coverage [Member] |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 10,987,000 | 10,860,000 | 11,030,000
General Liability Coverage [Member] |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 24,000 | 35,000 | 21,000
Workers Compensation Coverage [Member] |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | $ 301,000 | $ 286,000 | $ 298,000

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