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Note 2 - Summary of Significant Accounting Policies (Details) - Schedule of Accounts, Notes, Loans and Financing Receivable - USD ($)
3 Months Ended
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