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Note 10 - Equity Investment
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Business Combination Disclosure [Text Block]
10.
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 account for our ownership interest in MWL under the equity method of accounting. We received
$1.2
million,
$5.0
million and
$8.5
million of our revenue for loads transported by our tractors and arranged by MWL in
2016,
2015
and
2014,
respectively. As of
December
31,
2016,
we also had a trade receivable in the amount of
$55,000
from MWL and an accrued liability of
$3.0
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.