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Note 11 - Convertible Notes (Details Textual)
3 Months Ended 12 Months Ended
Jun. 12, 2020
USD ($)
Apr. 14, 2020
USD ($)
Apr. 14, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument, Debt Default, Amount       $ 9,675,000 $ 9,675,000
Subsequent Event [Member]          
Debt Instrument, Convertible, Number of Equity Instruments     130,000    
Convertible Debt [Member]          
Debt Instrument, Convertible, Number of Equity Instruments       3,780,823 3,669,573
Convertible Debt [Member] | Subsequent Event [Member]          
Debt Instrument, Convertible, Number of Equity Instruments 2,107,963 2,073,963      
Debt Instrument, Debt Default, Amount $ 3,412,205 $ 3,357,805 $ 3,357,805