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Note 9 - Significant Customers and Industry Concentration
12 Months Ended
Dec. 31, 2014
Risks and Uncertainties [Abstract]  
Concentration Risk Disclosure [Text Block]

9.

SIGNIFICANT CUSTOMERS AND INDUSTRY CONCENTRATION


In 2014, 2013 and 2012, two customers, who are in the automobile manufacturing industry, accounted for 34%, 33% and 28% of revenues, respectively. 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 2014, 2013 and 2012, 48%, 46% and 37%, respectively, were derived from transportation services provided to the automobile manufacturing industry. Accounts receivable from the two largest customers totaled approximately $22,965,000 and $28,290,000 at December 31, 2014 and 2013, respectively.