SIGNIFICANT CUSTOMERS AND EXPORT SALES (Product Sales) (Details) (Sales Revenue, Goods, Net [Member], Product Concentration Risk [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2011 primarygroupings	Jun. 30, 2010 primarygroupings	Jun. 30, 2011 primarygroupings	Jun. 30, 2010 primarygroupings
Revenue from External Customer [Line Items]
Number of primary groupings of low-power AC-DC power-conversion products	3	3	3	3
Primary Low Power AC DC Power Conversion Products [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage of total net revenues	98.00%	99.00%	98.00%	99.00%
LinkSwitch [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage of total net revenues	43.00%	35.00%	41.00%	35.00%
TinySwitch [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage of total net revenues	31.00%	39.00%	33.00%	39.00%
TOPSwitch [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage of total net revenues	24.00%	25.00%	24.00%	25.00%
Other Product Families [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage of total net revenues	2.00%	1.00%	2.00%	1.00%