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Note 11 - Convertible Notes Payable - Convertible Notes Payable (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Senior Secured Convertible Note [Member] | The Amended and Original Notes [Member]    
Convertible notes payable, net $ 2,061,472 $ 2,255,454
Principal amount 3,789,000 3,060,000
Less: conversion of principal into shares of common stock (1,500,000)
Net Principal amount 2,289,000 3,060,000
Less: unamortized debt discount and beneficial conversion feature (227,528) (574,330)
Less: unamortized debt issuance costs (230,216)
Notes payable, net of unamortized debt discount and debt issuance costs 2,061,472 2,255,454
Principal amount 2,289,000 3,060,000
Secured Redeemable Convertible Note [Member]    
Convertible notes payable, net 2,301,956  
Notes payable, net of unamortized debt discount and debt issuance costs 2,301,956  
Secured Redeemable Convertible Note [Member] | January 2020 Note [Member]    
Convertible notes payable, net 143,913
Net Principal amount 157,000
Less: unamortized debt issuance costs (39,907)
Notes payable, net of unamortized debt discount and debt issuance costs 143,913
Principal amount 157,000
Add: prepayment premium 23,550
Add: accrued interest 3,270
Secured Redeemable Convertible Note [Member] | February 2020 Note [Member]    
Convertible notes payable, net 96,571
Net Principal amount 126,000
Less: unamortized debt issuance costs (43,604)
Notes payable, net of unamortized debt discount and debt issuance costs 96,571
Principal amount 126,000
Add: prepayment premium 12,600
Add: accrued interest $ 1,575
Convertible Debt [Member]    
Convertible notes payable, net   2,255,454
Notes payable, net of unamortized debt discount and debt issuance costs   $ 2,255,454