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

Represents self insurance auto liability claims threshold amount.

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For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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