Note N - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Gains (losses) on available-for-sale marketable securities		$ (15)		$ 17
Total, net of income taxes		(15)		17
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Total, net of income taxes		(15)		1
Research and development		(12)		1
Sales and marketing		(1)
General and administrative		(2)
Total, before income taxes		(15)		1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Total, net of income taxes		4		11
Research and development		2		6
Sales and marketing		2		5
Total, before income taxes		4		11
Reclassification out of Accumulated Other Comprehensive Income [Member]
Total, net of income taxes		(26)		29
Gains (losses) on available-for-sale marketable securities		344	$ 245	910	$ 871
Total, net of income taxes		5,334	167	3,501	1,670
Research and development	[1]	8,504	8,709	26,430	26,680
Sales and marketing	[2]	3,617	3,071	10,332	9,108
General and administrative	[3]	2,064	2,409	6,622	7,390
Total, before income taxes		$ 5,668	$ 308	$ 3,995	$ 2,073

[1] Includes equity-based compensation expense in the amount of $668 and $546 for the three months ended September 30, 2016 and 2015, respectively; and $1,615 and $1,697 for the nine months ended September 30, 2016 and 2015, respectively.

[2] Includes equity-based compensation expense in the amount of $230 and $161 for the three months ended September 30, 2016 and 2015, respectively; and $555 and $491 for the nine months ended September 30, 2016 and 2015, respectively.

[3] Includes equity-based compensation expense in the amount of $465 and $479 for the three months ended September 30, 2016 and 2015, respectively; and $1,293 and $1,509 for the nine months ended September 30, 2016 and 2015, respectively.