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Note 13 - Fair Value of Financial Instruments (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative Liability, Total $ 945,736   $ 945,736    
Assets, Fair Value Disclosure 233,642   233,642    
2020 Warrant Agreement [Member]          
Derivative Liability, Total 450,000   450,000    
The 2021 Warrant Agreement [Member]          
Derivative Liability, Total 500,000   500,000    
Fair Value, Recurring [Member]          
Financial and Nonfinancial Liabilities, Fair Value Disclosure         $ 0
Assets, Fair Value Disclosure         0
Fair Value, Nonrecurring [Member]          
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0   0
Fair Value Measurement with Unobservable Inputs, Liability, Realized Gain (Loss) 0 $ 0 0 $ 0  
Assets, Fair Value Disclosure $ 0   $ 0   $ 0