Note 14 - Taxes on Income (Details Textual) $ in Thousands, ₪ in Billions		12 Months Ended
		Dec. 31, 2020 USD ($)	Dec. 31, 2020 ILS (₪)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Tax Cuts and Jobs Act of 2017, Transition Tax, Income Tax Expense (Benefit)						$ 16,053
Deferred Tax Assets, Net, Total	[1]	$ 10,826		$ 10,605
Unrecognized Tax Benefits, Ending Balance		1,558		1,037	$ 2,739
Unrecognized Tax Benefits, Income Tax Penalties Accrued					$ 0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		134		16
Unrecognized Tax Benefits, Decreases Resulting from Tax Audit Completion		$ (0)		2,164
Maximum [Member] | Technological Preferred Enterprise [Member]
Taxable Income Subject to Lower Tax Rate | ₪			₪ 10
Foreign Tax Authority [Member]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions				$ 1,029
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		12.50%	12.50%
Open Tax Year		2015 2016 2017 2018 2019 2020	2015 2016 2017 2018 2019 2020
Operating Loss Carryforwards, Total		$ 57,636
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member] | Interest Income [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		25.00%	25.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member]
Open Tax Year		2018 2019 2020	2018 2019 2020
Income Tax Rate, Foreign Ownership Exceeds 90%		10.00%	10.00%
Income Tax Rate, Foreign Ownership Exceeds 49%		20.00%	20.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		23.00%	23.00%	23.00%	23.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Dividends Paid to Foreign Companies [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		4.00%	4.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Intellectual Property [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		12.00%	12.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Intellectual Property [Member] | Development Area A [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		7.50%	7.50%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Minimum [Member]
Tax Exemption Period (Year)		2 years	2 years
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Maximum [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		23.00%	23.00%
Tax Exemption Period (Year)		10 years	10 years
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member]
Open Tax Year		2017 2018 2019 2020	2017 2018 2019 2020
Effective Income Tax Rate Reconciliation, Taxable Profit Up to 500,000 Euros, Percent				28.00%	28.00%
Effective Income Tax Rate Reconciliation, Taxable Profit Above 500,000 Euros, Percent				31.00%	33.33%
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2020 [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		28.00%	28.00%
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2021 [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		26.50%	26.50%
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2022 [Member]
Effective Income Tax Rate Reconciliation, Percent, Total		25.00%	25.00%
Domestic Tax Authority [Member]
Deferred Tax Assets, Net, Total		$ 45		$ 161
Operating Loss Carryforwards, Total		4,991
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards, Total		$ 17,759
Net Operating Loss Carryforwards Begins to Expire		2030	2030

[1] $161 and $45 net deferred taxes for the years ended December 31, 2019 and 2020, respectively, are from domestic jurisdictions.