Note 15 - Taxes on Income - Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gross unrecognized tax benefits at January 1,	$ 2,040	$ 1,273	$ 1,023
Decreases in tax positions for previous years	(175)		(268)
Increases in tax positions for current year	1,153	776	306
Increase in tax positions for previous years	95		131
Change in interest and linkage related to tax positions	57	(9)	81
Gross unrecognized tax benefits at December 31,	$ 3,170	$ 2,040	$ 1,273

Amount of change in unrecognized tax benefits resulting from changes in interest and linkage related to tax positions.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
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-Section 50
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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