Note F - Significant Customers - Sales to Major Customers (Distributors) As a Percentage of Total Revenues (Details) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
VTech Holdings Ltd [Member]
Concentration risk, percentage		21.00%	24.00%	23.00%	28.00%
Nexty Electronics Corporation [Member]
Concentration risk, percentage	[1],[2]	12.00%	15.00%	12.00%	12.00%
Ascend Technology Inc [Member]
Concentration risk, percentage	[1],[3]	29.00%	24.00%	27.00%	22.00%

[1] Distributor.

[2] Nexty Electronics sells the Companys products to a limited number of customers; one of those customers Panasonic accounted for 10% and 13% of the Companys total revenues for the three month periods ended September 30, 2018 and 2017, respectively, and 10% of the Companys total revenues for both the nine month periods ended September 30, 2018 and 2017, respectively.

[3] Ascend Technology sells the Companys products to a limited number of customers; one of those customers Avaya accounted for 10% and 6% of the Companys total revenues for the three month periods ended September 30, 2018 and 2017, respectively, and 6% and 4% of the Companys total revenues for the nine month periods ended September 30, 2018 and 2017, respectively.