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Note 3 - Revenue Recognition - Revenue by Major Product Category (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue, net $ 62,547   $ 56,693 $ 157,193 $ 161,233
Percent of Revenue   100.00% 100.00% 100.00% 100.00%
CATV [Member]          
Revenue, net 10,268   $ 31,260 $ 47,391 $ 79,953
Percent of Revenue   16.40% 55.20% 30.10% 49.60%
Data Center [Member]          
Revenue, net 48,807   $ 17,697 $ 96,731 $ 60,608
Percent of Revenue   78.00% 31.20% 61.50% 37.50%
Telecom [Member]          
Revenue, net 3,074   $ 6,821 $ 11,013 $ 18,362
Percent of Revenue   5.00% 12.00% 7.00% 11.40%
FTTH [Member]          
Revenue, net 0   $ 0 $ 57 $ 124
Percent of Revenue   0.00% 0.00% 0.10% 0.10%
Product and Service, Other [Member]          
Revenue, net $ 398   $ 915 $ 2,001 $ 2,186
Percent of Revenue   0.60% 1.60% 1.30% 1.40%