Note 1 - Accounting Policies (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Bank Overdrafts	$ 7,638,000	$ 2,572,000
Due from Employees, Current	136,000	211,000
Other Receivables, Net, Current, Total	5,127,000	3,769,000
Impairment of Long-Lived Assets Held-for-use	$ 0	0
Period for Amortizing Prepaid Tires (Month)	24 months
Advertising Expense	$ 1,102,000	$ 1,269,000	$ 1,234,000
Truckload Services [Member] \| Sales [Member] \| Product Concentration Risk [Member]
Concentration Risk, Percentage	76.90%	82.70%	80.00%
Independent Contractors [Member]
Other Receivables, Net, Current, Total	$ 614,000	$ 1,381,000

The number of months that prepaid tires are amortized over.

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amounts due from an Entity employee, not to include stockholders or officers, which are usually due within 1 year (or 1 business cycle).

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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