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Note 12 - Significant Customers / Concentration - Concentration of Risk (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue Benchmark [Member] | Customer A [Member]
Concentration Risk, Percentage	27.00%	29.00%
Revenue Benchmark [Member] | Customer B [Member]
Concentration Risk, Percentage	10.00%	15.00%
Revenue Benchmark [Member] | Customer C [Member]
Concentration Risk, Percentage		18.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration Risk, Percentage	39.00%	39.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration Risk, Percentage	12.00%
Accounts Receivable [Member] | Customer D [Member]
Concentration Risk, Percentage	16.00%	0.00%
Accounts Receivable [Member] | Customer E [Member]
Concentration Risk, Percentage		15.00%

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
-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

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