SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Dividends Declared [Table Text Block]

	Year Ended December 31,
	2015		2014		2013
First Quarter	$	0.12	$	0.10	$	0.08
Second Quarter	$	0.12	$	0.10	$	0.08
Third Quarter	$	0.12	$	0.12	$	0.08
Fourth Quarter	$	0.12	$	0.12	$	0.08

Available-for-sale Securities [Table Text Block]

Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at December 31, 2015, were as follows:

	Amortized		Gross Unrealized					Estimated Fair
(in thousands)	Cost		Gains		Losses			Market Value
Investments due in less than 3 months:
Corporate securities	$	38,586	$	7	$	(10	)	$	38,583
Total	38,586		7		(10		)	38,583
Investments due in 4-12 months:
Corporate securities	33,654		1		(36		)	33,619
Total	33,654		1		(36		)	33,619
Investments due between 12 months and 5-years:
Corporate securities	11,626		—		(59		)	11,567
Total	11,626		—		(59		)	11,567
Total investment securities	$	83,866	$	8	$	(105	)	$	83,769

Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at December 31, 2014, were as follows:

	Amortized		Gross Unrealized					Estimated Fair
(in thousands)	Cost		Gains		Losses			Market Value
Investments due in 4-12 months:
Corporate securities	$	30,233	$	36	$	—		$	30,269
Total	30,233		36		—			30,269
Investments due between 12 months and 5-years:
Corporate securities	84,259		92		(45		)	84,306
Total	84,259		92		(45		)	84,306
Total investment securities	$	114,492	$	128	$	(45	)	$	114,575

Schedule of Inventories [Table Text Block]

Inventories consist of the following:

(in thousands)	December 31, 2015		December 31, 2014
Raw materials	$	19,090	$	21,127
Work-in-process	12,770		14,643
Finished goods	20,074		28,255
Total	$	51,934	$	64,025

Schedule of Accounts Receivable [Table Text Block]

Accounts receivable:

(in thousands)	December 31, 2015			December 31, 2014
Accounts receivable trade	$	43,622		$	38,344
Accrued ship and debit and rebate claims	(35,486		)	(27,967		)
Allowance for doubtful accounts	(318		)	(191		)
Total	$	7,818		$	10,186

Schedule of Prepaid Expenses and Other Current Assets [Table Text Block]

Prepaid expenses and other current assets:

(in thousands)	December 31, 2015		December 31, 2014
Prepaid legal fees	$	2,023	$	1,506
Loan to Cambridge Semiconductor (Note 11)	—		6,600
Advance to suppliers	324		800
Prepaid income tax	309		3,208
Prepaid maintenance agreements	736		1,023
Interest receivable	519		664
Other	2,879		2,578
Total	$	6,790	$	16,379

Schedule of Property and Equipment [Table Text Block]

Building and improvements	4-40 years
Machinery and equipment	2-8 years
Computer software and hardware and office furniture and fixtures	4-7 years

Property and equipment consist of the following:

(in thousands)	December 31, 2015			December 31, 2014
Land	$	20,288		$	16,754
Construction-in-progress	2,298			8,068
Building and improvements	51,941			44,794
Machinery and equipment	128,342			124,138
Computer software and hardware and office furniture and fixtures	43,383			37,867
	246,252			231,621
Accumulated depreciation	(146,871		)	(135,798		)
Total	$	99,381		$	95,823

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Changes in accumulated other comprehensive income (loss) for the three years ended December 31, 2015:

(in thousands)	Unrealized Gains and Losses on Available-for-Sale Securities			Defined Benefit Pension Items				Foreign Currency Items			Total
Balance at January 1, 2013	$	138		$	(560	)		$	129		$	(293	)
Other comprehensive income (loss) before reclassifications	72			(277		)		(29		)	(234		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			57			(1)	—			57
Other comprehensive income (loss)	72			(220		)		(29		)	(177		)
Balance at December 31, 2013	210			(780		)		100			(470		)
Other comprehensive income (loss) before reclassifications	(127		)	(538		)		(79		)	(744		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			78			(1)	—			78
Other comprehensive income (loss)	(127		)	(460		)		(79		)	(666		)
Balance at December 31, 2014	83			(1,240		)		21			(1,136		)
Other comprehensive income (loss) before reclassifications	(180		)	(469		)		(191		)	(840		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			125			(1)	—			125
Other comprehensive income (loss)	(180		)	(344		)		(191		)	(715		)
Balance at December 31, 2015	$	(97	)	$	(1,584	)		$	(170	)	$	(1,851	)

_