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Note 2 - Summary of Significant Accounting Policies (Details) - Schedule of Accounts, Notes, Loans and Financing Receivable - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Schedule of Accounts, Notes, Loans and Financing Receivable [Abstract] |  |
Balance at January 1, 2019 | $ 224,795 |
Reversal – recoveries by cash | (169,432) | $ 321,970
Balance at March 31, 2019 | $ 55,363 |

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