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Note 4 - Related Party Transactions | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Related Party Transactions Disclosure [Text Block] | 4. Related Party Transactions The following related party transactions occurred during the three years ended December 31, 2017; (a) We purchase fuel and tires and obtain related services from a company in which one of our directors is the chairman of the board, chief executive officer and the principal stockholder. We paid that company $328,000 in 2017, $361,000 in 2016 and $335,000 in 2015 for fuel, tires and related services. In addition, we paid $2.5 million in 2017, $2.0 million in 2016 and $1.5 million in 2015 to tire manufacturers for tires that were provided by the same company. The same company received commissions from the tire manufacturers related to these purchases. We did not have any payables to that company as of December 31, 2017 or 2016 . (b) We provide transportation services to MWL as described in Note 11 .

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- Definition The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -URI http://asc.fasb.org/topic&trid=2122745 + Details
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