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B. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - VARIOUS POLICIES (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) patent	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash and cash equivalents	$ 50,224,000	$ 28,074,000	$ 32,175,000	$ 22,006,000
Cash in excess of FDIC insurance	$ 40,800,000
Percentage of compensation deposit	30.00%
Restricted cash	$ 1,732,000	4,719,000
Pledged certificate of deposit for line of credit	0	7,900,000
Accrued product warranty	$ 705,000	412,000
Number of years of land use rights	50 years
Land use rights expiration date	October 7, 2054
Number of patents \| patent	210
Estimated useful life	8 years 7 months 6 days
Advertising Costs	$ 157,000	$ 104,000	$ 100,000
Windfall tax benefits	$ 1,300,000
Patents [Member]
Estimated useful life	20 years
Sales Revenue, Net [Member] \| Five Customers [Member]
Concentration of credit risk	87.80%	81.80%	72.00%
Sales Revenue, Net [Member] \| Amazon [Member]
Concentration of credit risk	54.60%	52.50%	45.80%
Sales Revenue, Net [Member] \| Microsoft [Member]
Concentration of credit risk	18.30%	11.60%
Sales Revenue, Net [Member] \| Cisco [Member]
Concentration of credit risk		10.40%	8.90%
Sales Revenue, Net [Member] \| Arris [Member]
Concentration of credit risk	5.80%
Sales Revenue, Net [Member] \| Leading Internet Service Provider [Member]
Concentration of credit risk			6.70%
Accounts Receivable [Member] \| Five Customers [Member]
Concentration of credit risk	88.30%	80.00%
Accounts Receivable [Member] \| Amazon [Member]
Concentration of credit risk	62.10%	51.40%
Accounts Receivable [Member] \| Arris [Member]
Concentration of credit risk	10.60%
Accounts Receivable [Member] \| Wesco [Member]
Concentration of credit risk		14.40%
Foreign Accounts [Member]
Cash and cash equivalents	$ 10,700,000	$ 8,900,000
TAIWAN, PROVINCE OF CHINA
Certificates of deposit	$ 0	$ 7,900,000
Percentage of collateral pledged	100
TAIWAN, PROVINCE OF CHINA \| Minimum
Maturity dates	6 months
TAIWAN, PROVINCE OF CHINA \| Maximum
Maturity dates	12 months