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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts | $ (50,565) | $ (24,121)
Accounts receivable, net | 4,464,444 | 1,095,777
Trade Accounts Receivable [Member] |  |
Accounts receivable, gross | 3,621,695 | 828,287
Premium [Member] |  |
Accounts receivable, gross | 890,974 | 288,039
Anticipated Salvage and Subrogation [Member] |  |
Accounts receivable, gross | $ 2,340 | $ 3,572

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