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Note 9 - Significant Customers and Industry Concentration
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Concentration Risk Disclosure [Text Block]
9.
SIGNIFICANT CUSTOMERS AND INDUSTRY CONCENTRATION
 
In
2016,
two
customers, who are in the automobile manufacturing industry, accounted for
28%
of revenues. In
2015,
three
customers, who are in the automobile manufacturing industry, accounted for
37%
of revenues. In
2014,
two
customers, who are in the automobile manufacturing industry, accounted for
34%
of revenues. The Company also provides transportation services to other manufacturers who are suppliers for automobile manufacturers including suppliers for the Company’s largest customer. As a result, concentration of the Company’s business within the automobile industry is significant. Of the Company’s revenues for
2016,
2015
and
2014,
45%,
47%
and
48%,
respectively, were derived from transportation services provided to the automobile manufacturing industry. Accounts receivable from the
three
largest customers totaled approximately
$27,085,000
and
$27,051,000
at
December
31,
2016
and
2015,
respectively.