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Note 10 - Convertible Notes Payable - Notes Payable (Details) - Convertible Debt [Member]
Jun. 30, 2019
USD ($)
Principal amount $ 707,000
Less unamortized debt discount (24,533)
Less unamortized debt issuance costs (140,800)
Notes payable, net of unamortized debt discount and debt issuance costs $ 541,667