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Note 6 - Major Customers (Details Textual) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Number of Major Customers | 0 | 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Texas Instruments Incorporated [Member] |  |
Concentration Risk, Percentage | 16.00% |

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