Note 3 - Revenue Recognition - Revenue by Major Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total Revenue	$ 53,267	$ 76,608	$ 157,157	$ 182,298
Percent of Revenue	100.00%	100.00%	100.00%	100.00%
Data Center [Member]
Total Revenue	$ 23,929	$ 55,336	$ 72,259	$ 141,133
Percent of Revenue	44.90%	72.20%	46.00%	77.40%
CATV [Member]
Total Revenue	$ 23,101	$ 11,642	$ 69,339	$ 22,007
Percent of Revenue	43.40%	15.20%	44.10%	12.10%
Telecom [Member]
Total Revenue	$ 5,148	$ 8,870	$ 12,959	$ 17,600
Percent of Revenue	9.70%	11.60%	8.20%	9.70%
FTTH [Member]
Total Revenue	$ 62	$ 67	$ 784	$ 69
Percent of Revenue	0.10%	0.10%	0.50%	0.00%
Product and Service, Other [Member]
Total Revenue	$ 1,027	$ 693	$ 1,816	$ 1,489
Percent of Revenue	1.90%	0.90%	1.20%	0.80%