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Note 10 - Significant Customers | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Concentration Risk Disclosure [Text Block] | 10. Significant Customers Sales to significant customers that represented more than 10 percent of total revenues are as follows:
|  | Year ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Customer A |  |  | 16.1 | % |  |  | 16.3 | % |  |  | 14.2 | %
Customer B |  |  | - | %* |  |  | - | %* |  |  | 10.4 | %
Total |  |  | 16.1 | % |  |  | 16.3 | % |  |  | 24.6 | %
* Sales did not exceed 10% of the revenue. The following table summarizes the percentage of total gross accounts receivable from significant customers:
| As of December 31, |
| 2017 |  | 2016 |
Customer A |  | 20.3 | % |  | 13.4 | %
Customer B |  | 11.0 | % |  | 11.7 | %
Total |  | 31.3 | % |  | 25.1 | %
These customers facilitate product sales to a large number of end-users, none of which is known to account for more than 10 percent of the Company’s revenue from product sales. Nevertheless, the loss of one or more of these customers could reduce revenue and have a material adverse effect on the Company’s business and results of operations.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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