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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES | 3 Months Ended
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Mar. 31, 2019
Risks and Uncertainties [Abstract] |
Concentration Risk Disclosure [Text Block] | SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES: Segment Reporting The Company is organized and operates as one reportable segment, the design, development, manufacture and marketing of integrated circuits and related components for use primarily in the high-voltage power-conversion market. The Company’s chief operating decision maker, the Chief Executive Officer, reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance. Customer Concentration The Company's top ten customers accounted for approximately 52% of net revenues for the three months ended March 31, 2019, and approximately 58% of net revenues in the corresponding period of the previous year. A significant portion of these revenues are attributable to sales of the Company’s products to distributors of electronic components. These distributors sell the Company’s products to a broad, diverse range of end users, including OEMs and merchant power supply manufacturers. Sales to distributors were $69.8 million and $79.1 million in the three months ended March 31, 2019 and 2018, respectively. Direct sales to OEMs and power-supply manufacturers accounted for the remainder. In each of the three months ended March 31, 2019 and 2018, one customer, a distributor of the Company's products, accounted for more than 10% of the Company’s net revenues. The following table discloses this customer’s percentage of revenues for the respective periods:
| Three Months Ended
Customer | March 31, 2019 |  | March 31, 2018
Avnet | 13 | % |  | 16 | %
No other customers accounted for 10% or more of the Company’s net revenues in the periods presented. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash investments and trade receivables. The Company does not have any off-balance-sheet credit exposure related to its customers. As of March 31, 2019, and December 31, 2018, 68% and 64%, respectively, of accounts receivable were concentrated with the Company’s top ten customers. The following customers represented 10% or more of accounts receivable:
Customer | March 31, 2019 |  | December 31, 2018
Avnet | 18 | % |  | 17 | %
Powertech Distribution Ltd. | 11 | % |  | 11 | %
No other customers accounted for 10% or more of the Company’s accounts receivable in the periods presented. Geographic Net Revenues The Company markets its products globally through its sales personnel and a worldwide network of independent sales representatives and distributors. Geographic net revenues, based on “bill to” customer locations, for the three months ended March 31, 2019, and March 31, 2018, were as follows:
| Three Months Ended
(In thousands) | March 31, 2019 |  | March 31, 2018
United States of America | $ | 2,672 |  |  | $ | 3,867 |
Hong Kong/China | 47,229 |  |  | 51,357 |
Taiwan | 6,672 |  |  | 11,886 |
Korea | 8,542 |  |  | 9,649 |
Western Europe (excluding Germany) | 10,901 |  |  | 13,592 |
Japan | 3,650 |  |  | 4,551 |
Germany | 4,927 |  |  | 3,304 |
Other | 4,595 |  |  | 4,875 |
Total net revenues | $ | 89,188 |  |  | $ | 103,081 |

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