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Note 8 - Equity Investment
 6 Months Ended
Jun. 30, 2016
Notes to Financial Statements  
Business Combination Disclosure [Text Block]

(8)     Equity Investment
 
We own a 45% equity interest in MWL, a third-party provider of logistics services to the transportation industry. A non-related party owns the other 55% equity interest in MWL. We received $966,000 and $3.7 million of our revenue for loads transported by our tractors and arranged by MWL in the six-month periods ended June 30, 2016 and June 30, 2015, respectively. As of June 30, 2016, we also had a trade receivable in the amount of $52,000 from MWL and an accrued liability of $3.8 million to MWL for the excess of payments by MWL’s customers into our lockbox account over the amounts drawn on the account by MWL.