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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Allowance for doubtful accounts | $ (127,635) | $ (50,565)
Accounts receivable, net | 4,190,543 | 4,464,444
Trade Accounts Receivable [Member] |  |
Accounts receivable, gross | 3,346,215 | 3,621,695
Premium [Member] |  |
Accounts receivable, gross | 971,963 | 890,974
Anticipated Salvage and Subrogation [Member] |  |
Accounts receivable, gross |  | $ 2,340

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