Note 2 - Summary of Significant Accounting Policies - Concentrations (Details)	12 Months Ended
Dec. 31, 2019 customer	Dec. 31, 2018
Revenue Benchmark
Concentrations
Concentration Risk, Percentage	75.00%
Customer Concentration Risk \| Revenue Benchmark
Concentrations
Number of Major Customers	2	5
Concentration Risk, Percentage	42.00%	63.00%
Customer Concentration Risk \| Accounts Receivable.
Concentrations
Concentration Risk, Percentage	58.00%	72.00%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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