SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Inventories [Abstract]
Raw materials	$ 10,564,000				$ 12,389,000								$ 10,564,000	$ 12,389,000
Work-in-process	12,122,000				7,841,000								12,122,000	7,841,000
Finished goods	21,939,000				31,780,000								21,939,000	31,780,000
Total	44,625,000				52,010,000								44,625,000	52,010,000
Accounts Receivable [Abstract]
Accounts receivable trade	33,866,000				27,972,000								33,866,000	27,972,000
Accrued ship and debit and rebate claims	(26,293,000)				(18,361,000)								(26,293,000)	(18,361,000)
Allowance for doubtful accounts	(247,000)				(215,000)								(247,000)	(215,000)
Total	7,326,000				9,396,000								7,326,000	9,396,000
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid legal fees	1,760,000				3,500,000								1,760,000	3,500,000
Advance to supplier	1,170,000				0								1,170,000	0
Prepaid income tax	11,463,000				118,000								11,463,000	118,000
Prepaid maintenance agreements	616,000				669,000								616,000	669,000
Interest receivable	149,000				625,000								149,000	625,000
Other	2,243,000				2,156,000								2,243,000	2,156,000
Total	17,401,000				7,068,000								17,401,000	7,068,000
Other Assets [Abstract]
Prepaid royalty (Note 12)	0				10,000,000								0	10,000,000
Investment in third party (Note 12)	0				7,000,000								0	7,000,000
Financing lease receivables and deposits (Note 12)	0				7,558,000								0	7,558,000
Distributor ship and debit advance credit	2,536,000				0								2,536,000	0
Other	2,137,000				1,953,000								2,137,000	1,953,000
Total	4,673,000				26,511,000								4,673,000	26,511,000
Other Accrued Liabilities [Abstract]
Accrued professional fees	1,328,000				892,000								1,328,000	892,000
Accrued expense for engineering wafers	516,000				402,000								516,000	402,000
Advances from customers	646,000				596,000								646,000	596,000
Other	949,000				415,000								949,000	415,000
Total	3,439,000				2,305,000								3,439,000	2,305,000
Employee Benefits Plan [Abstract]
Company contribution to 401(k)													0	0	700,000
Concentration Risk [Line Items]
Payments of dividends	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	1,400,000	5,755,000	5,722,000	5,577,000
Deferred Revenue [Abstract]
Sell-through deferred revenue	20,700,000				18,100,000								20,700,000	18,100,000
Sell-through deferred cost	9,100,000				8,800,000								9,100,000	8,800,000
Foreign Exchange Transactions [Abstract]
Foreign exchange transaction gain														50,000
Foreign exchange transaction losses													600,000		400,000
Warranty [Abstract]
Product warranty period													12 months
Advertising [Abstract]
Advertising costs													$ 1,100,000	$ 1,000,000	$ 1,000,000
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Distributors [Member]
Deferred Revenue [Abstract]
Concentration risk percentage													74.00%
CHINA | Geographic Concentration Risk [Member] | Property and Equipment [Member]
Deferred Revenue [Abstract]
Concentration risk percentage									10.00%