Note M - Segment Information (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Product Concentration Risk [Member] | Sales Revenue, Segment [Member] | Home [Member] | Telephony [Member]
Concentration Risk, Percentage	57.00%	72.00%	56.00%	74.00%
Product Concentration Risk [Member] | Sales Revenue, Segment [Member] | Home [Member] | Gateway [Member]
Concentration Risk, Percentage	8.00%	6.00%	8.00%	10.00%
Product Concentration Risk [Member] | Sales Revenue, Segment [Member] | Office [Member] | Gateway [Member]
Concentration Risk, Percentage	20.00%	18.00%	20.00%	14.00%
Product Concentration Risk [Member] | Sales Revenue, Segment [Member] | Mobile [Member]
Concentration Risk, Percentage	12.00%	0.00%	13.00%	0.00%
Number of Reportable Segments			3