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Note R - Segment and Geographic Information (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of Reportable Segments 1    
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 211,565 $ 234,623 $ 190,872
Percentage of Revenue 100.00% 100.00% 100.00%
Data Center [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 97,461 $ 173,437 $ 143,562
Percentage of Revenue 46.10% 73.90% 75.20%
CATV [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 94,266 $ 37,944 $ 37,328
Percentage of Revenue 44.60% 16.20% 19.60%
Telecom [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 16,247 $ 21,092 $ 8,429
Percentage of Revenue 7.70% 9.00% 4.40%
FTTH [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 957 $ 110 $ 190
Percentage of Revenue 0.50% 0.00% 0.10%