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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ (128,010)	$ (50,565)
Accounts receivable, net	5,377,949	4,464,444
Trade Accounts Receivable [Member]
Accounts receivable, gross	3,490,653	3,621,695
Premium [Member]
Accounts receivable, gross	2,015,306	890,974
Anticipated Salvage and Subrogation [Member]
Accounts receivable, gross		$ 2,340

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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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