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Note 4 - Related Party Transactions
 12 Months Ended
Dec. 31, 2015
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, 2015;
 
(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 $335,000 in 2015, $562,000 in 2014 and $585,000 in 2013 for fuel, tires and related services. In addition, we paid $1.5 million in 2015, $1.4 million in 2014 and $1.6 million in 2013 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 accounts payable to that company as of December 31, 2015, and did have $19,000 of payables to that company as of December 31, 2014.
 
(b)     We provide transportation services to MWL as described in Note 12.