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Note 9 - Convertible Notes - Related Party (Details Textual)
3 Months Ended
Jun. 12, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Interest Expense, Related Party   $ 105,451 $ 113,213  
Debt Instrument, Debt Default, Amount   9,675,000    
Convertible Debt Payable to Related Party [Member]        
Interest Payable, Related Party   873,984   $ 814,115
Interest Expense, Related Party   $ 59,869 $ 59,129  
Debt Instrument, Convertible, Number of Equity Instruments   1,599,176    
Convertible Debt Payable to Related Party [Member] | Subsequent Event [Member]        
Debt Instrument, Debt Default, Amount $ 926,368      
Convertible Debt to Related Party in Default [Member] | Subsequent Event [Member]        
Debt Instrument, Convertible, Number of Equity Instruments 578,980