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Note 8 - Geographic Information and Major Customer Data - Major Customers Data As Percentage of Total Revenues (Details) - Revenue from Contract with Customer Benchmark [Member] - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Customer A [Member]
Percentage of total revenues	20.00%	14.00%	18.00%	17.00%
Customer B [Member]
Percentage of total revenues		17.00%		15.00%
Customer C [Member]
Percentage of total revenues	18.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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