Note 1 - General (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
VTech Holdings Ltd. [Member]
Note 1 - General (Details) [Line Items]
Concentration Risk, Percentage	31.00%	35.00%	36.00%
Guo Wei Electronics [Member]
Note 1 - General (Details) [Line Items]
Concentration Risk, Percentage	12.00%	8.00%	8.00%
Tomen Electronics Corporation [Member]
Note 1 - General (Details) [Line Items]
Concentration Risk, Percentage	16.00%	20.00%	19.00%
Panasonic Communications Corporation [Member]
Note 1 - General (Details) [Line Items]
Concentration Risk, Percentage	13.00%	15.00%	14.00%
Ascend Technology Inc [Member]
Note 1 - General (Details) [Line Items]
Concentration Risk, Percentage	15.00%	10.00%	9.00%