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Note 5 - Accounts Receivable and Customer Concentrations | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Loans, Notes, Trade and Other Receivables Disclosure [Text Block] |
5. | ACCOUNTS RECEIVABLE and customer concentrations
At December 31, 2016 and 2015, our allowance for doubtful accounts amounted to $15,000 and $0, respectively. Net charges against the allowance for doubtful accounts were $ 0 in both 2016 and 2015. The following table indicates the percentage of consolidated revenue from continuing operations and year-end accounts receivable represented by each customer that represented more than 10 percent of consolidated revenue from continuing operations or year-end accounts receivable.
|  | Revenue |  |  | Accounts Receivable |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Customer A |  |  | 13.2 | % |  |  | 22.5 | % |  |  | 14.2 | % |  |  | 23.6 | %
Customer B |  |  | 28.5 | % |  |  | 2.0 | % |  |  | 52.2 | % |  |  | 28.9 | %
Customer C |  |  | 10.3 | % |  |  | 18.7 | % |  |  | 5.2 | % |  |  | 6.4 | %
Customer D |  |  | 3.6 | % |  |  | 3.9 | % |  |  | 3.2 | % |  |  | 11.6 | %
Subsequent to December 31, 2016, Customer B remitted payments totaling approximately $547,000 in January 2017 for a total payment of 79% of their year-end accounts receivable balance.

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