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Note 5 - Accounts Receivable and Customer Concentrations | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Loans, Notes, Trade and Other Receivables Disclosure [Text Block] |
5. | ACCOUNTS RECEIVABLE and customer concentrations
At December 31, 201 7 and 2016, our allowance for doubtful accounts amounted to $0 and $15,000 respectively. Net charges against the allowance for doubtful accounts were $15,000 and $0 in 2017 and 2016, respectively. 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 |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Customer A |  |  | 9.3 | % |  |  | 13.2 | % |  |  | 15.2 | % |  |  | 14.2 | %
Customer B |  |  | 26.6 | % |  |  | 28.5 | % |  |  | 25.8 | % |  |  | 52.2 | %
Customer C |  |  | 11.9 | % |  |  | 10.3 | % |  |  | 9.0 | % |  |  | 5.2 | %
Customer D |  |  | 11.3 | % |  |  | 6.4 | % |  |  | 7.6 | % |  |  | 5.9 | %

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