Note N - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Research and development	[1]	$ 9,161	$ 9,036	$ 18,351	$ 17,925
Sales and marketing	[2]	3,430	3,323	7,005	6,715
General and administrative	[3]	2,372	2,275	4,859	4,558
Losses on available-for-sale marketable securities		418	273	834	565
Net income (loss)		(586)	1,080	(3,452)	(1,833)
Research and development	[1]	9,161	9,036	18,351	17,925
Sales and marketing	[2]	3,430	$ 3,323	7,005	$ 6,715
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income (loss)		(62)		(85)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Losses on available-for-sale marketable securities		11		58
Net income (loss)		11		58
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Research and development		(61)		(120)
Sales and marketing		(6)		(12)
General and administrative		(11)		(21)
Net income (loss)		(78)		(153)
Research and development		(61)		(120)
Sales and marketing		(6)		(12)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Research and development		3		7
Sales and marketing		2		3
General and administrative		5		10
Net income (loss)		5		10
Research and development		3		7
Sales and marketing		$ 2		$ 3

[1] Includes equity-based compensation expense in the amount of $623 and $521 for the three months ended June 30, 2017 and 2016, respectively; and $1,239 and $947 for the six months ended June 30, 2017 and 2016, respectively.

[2] Includes equity-based compensation expense in the amount of $297 and $194 for the three months ended June 30, 2017 and 2016, respectively; and $597 and $325 for the six months ended June 30, 2017 and 2016, respectively.

[3] Includes equity-based compensation expense in the amount of $543 and $461 for the three months ended June 30, 2017 and 2016, respectively; and $1,061 and $828 for the six months ended June 30, 2017 and 2016, respectively.