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Note 7 - Concentrations - Customers Representing 5% or More of Total Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Major Customers 1 [Member]
Revenue by customer	$ 54,300	$ 41,686
Major Customers 2 [Member]
Revenue by customer	13,990	38,333
Major Customers 3 [Member]
Revenue by customer	11,359	15,651
Major Customers 4 [Member]
Revenue by customer	10,563	14,307
Major Customers 5 [Member]
Revenue by customer	$ 9,583	$ 14,172

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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