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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts | $ (6,534) | $ (24,121)
Accounts receivable, net | 1,290,966 | 1,095,777
Trade Accounts Receivable [Member] |  |
Accounts receivable, gross | 995,055 | 828,287
Premium [Member] |  |
Accounts receivable, gross | 298,872 | 288,039
Anticipated Salvage and Subrogation [Member] |  |
Accounts receivable, gross | $ 3,573 | $ 3,572

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