Note 21 - Employee Benefit Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	60.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%	4.00%	3.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 1,600	$ 1,600	$ 1,400
Deposits And Other Assets Noncurrent	38,284	18,209
Severance Costs	3,500	3,000	3,200
Gain (Loss) Of Severance Fund	1,000	(1,100)	$ 1,800
Israeli Severance Funds [Member]
Deposits And Other Assets Noncurrent	$ 10,800	$ 10,600