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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ (73,480)	$ (127,635)
Accounts receivable, net	4,832,526	4,190,543
Trade Accounts Receivable [Member]
Accounts receivable, gross	3,593,213	3,346,215
Premium [Member]
Accounts receivable, gross	$ 1,312,793	$ 971,963

X

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

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