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Note 3 - Revenue Recognition | 6 Months Ended
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Jun. 30, 2023
Notes to Financial Statements |
Revenue from Contract with Customer [Text Block] | Note 3. Revenue Recognition ​ ​ Disaggregation of Revenue ​ Revenue is classified based on the location where the product is manufactured. For additional information on the disaggregated revenues by geographical region, see Note 17, "Geographic Information.” Revenue is also classified by major product category and is presented below (in thousands): ​
|  | Three months ended June 30, |
​ |  |  |  |  |  | % of |  |  |  |  |  |  | % of |
​ |  | 2023 |  |  | Revenue |  |  | 2022 |  |  | Revenue |
CATV |  | $ | 9,343 |  |  |  | 22.5 | % |  | $ | 23,713 |  |  |  | 45.3 | %
Data Center |  |  | 27,571 |  |  |  | 66.2 | % |  |  | 21,497 |  |  |  | 41.1 | %
Telecom |  |  | 4,231 |  |  |  | 10.2 | % |  |  | 6,276 |  |  |  | 12.0 | %
FTTH |  |  | 55 |  |  |  | 0.1 | % |  |  | 27 |  |  |  | 0.1 | %
Other |  |  | 415 |  |  |  | 1.0 | % |  |  | 786 |  |  |  | 1.5 | %
Total Revenue |  | $ | 41,615 |  |  |  | 100.0 | % |  | $ | 52,299 |  |  |  | 100.0 | %
​
|  | Six months ended June 30, |
​ |  |  |  |  |  | % of |  |  |  |  |  |  | % of |
​ |  | 2023 |  |  | Revenue |  |  | 2022 |  |  | Revenue |
CATV |  | $ | 37,123 |  |  |  | 39.2 | % |  | $ | 48,694 |  |  |  | 46.6 | %
Data Center |  |  | 47,924 |  |  |  | 50.6 | % |  |  | 42,911 |  |  |  | 41.0 | %
Telecom |  |  | 7,938 |  |  |  | 8.4 | % |  |  | 11,541 |  |  |  | 11.0 | %
FTTH |  |  | 57 |  |  |  | 0.1 | % |  |  | 124 |  |  |  | 0.1 | %
Other |  |  | 1,603 |  |  |  | 1.7 | % |  |  | 1,270 |  |  |  | 1.3 | %
Total Revenue |  | $ | 94,645 |  |  |  | 100.0 | % |  | $ | 104,540 |  |  |  | 100.0 | %
Unearned Revenue ​ We record unearned revenues when cash payments are received or due in advance of our performance, including amounts which are refundable. Unearned revenues solely relate to Microsoft's SOW contract prices allocated to the performance obligations that are unsatisfied, or partially unsatisfied, as of the balance sheet date. Unearned revenue balance as of June 30, 2023 and December 31, 2022 was $11.7 million and $3 million, respectively. For the three months ended June 30, 2023 and 2022, revenue recognized from the unearned revenue balance was $0.9 million and $0 million, respectively. For the six months ended June 30, 2023 and 2022, revenue recognized from the unearned revenue balance was $1.2 million and $0 million, respectively.

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