Note 14 - Accumulated Other Comprehensive Income (Details) - Reclassifications Out of Accumulated Other Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Losses on available-for-sale marketable securities		$ 292	$ 335
Total, net of income taxes		(2,913)	773
Research and development	[1]	8,889	9,116
Sales and marketing	[2]	3,392	3,063
	[3]	2,283	2,521
Total, before income taxes		(2,876)	$ 849
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total, net of income taxes		58
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Losses on available-for-sale marketable securities		25
Total, net of income taxes		25
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total, net of income taxes		29
Research and development		23
Sales and marketing		2
		4
Total, before income taxes		29
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total, net of income taxes		4
Research and development		2
Sales and marketing		2
Total, before income taxes		$ 4

[1] Includes equity-based compensation expense in the amount of $426 and $538 for the three months ended March 31, 2016 and 2015,respectively.

[2] Includes equity-based compensation expense in the amount of $131 and $152 for the three months ended March 31, 2016 and 2015,respectively.

[3] Includes equity-based compensation expense in the amount of $367 and $493 for the three months ended March 31, 2016 and 2015,respectively.