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Note 8 - Significant Customers / Concentration / Disaggregated Revenue - Concentration of Risk (Details) - Customer Concentration Risk [Member]		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Revenue Benchmark [Member] | Customer A [Member]
Concentration Risk, Percentage		35.00%		13.00%	[1]
Revenue Benchmark [Member] | Customer B [Member]
Concentration Risk, Percentage		12.00%		20.00%
Revenue Benchmark [Member] | Customer C [Member]
Concentration Risk, Percentage		12.00%			[1]
Revenue Benchmark [Member] | Customer D [Member]
Concentration Risk, Percentage		11.00%			[1]
Revenue Benchmark [Member] | Customer E [Member]
Concentration Risk, Percentage			[1]	19.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration Risk, Percentage		40.00%		39.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration Risk, Percentage		16.00%		15.00%
Accounts Receivable [Member] | Customer D [Member]
Concentration Risk, Percentage		11.00%			[1]
Accounts Receivable [Member] | Customer E [Member]
Concentration Risk, Percentage	[1]
[1] Zero or less than 10%

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
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

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- Details

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