Note 4 - Accounts Receivable - Accounts Receivable (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Accounts receivable	$ 2,446,486	$ 39,769
Provision for doubtful accounts	(53,708)	(27,666)
Net accounts receivable	$ 2,392,778	$ 12,103

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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