Note 3 - Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified from AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other income (expense), net	$ 573	$ (7)	$ 607
Revenues	411,172	362,963	321,607
Cost of revenues	89,439	79,226	69,517
Research and development	81,289	72,548	68,239
Sales and marketing	76,487	67,965	70,833
General and administrative	76,274	46,570	40,765
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Other income (expense), net	(22)	25	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Revenues	(1,667)	960	169
Cost of revenues	149	(76)	0
Research and development	492	(264)	0
Sales and marketing	28	(20)	0
General and administrative	65	(36)	0
Total	$ (933)	$ 564	$ 169