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Note 8 - Notes Payable - Payroll Protection Program (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 10, 2021
Apr. 27, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Gain (Loss) on Extinguishment of Debt, Total     $ 0 $ 0 $ 2,847,000 $ 0
Paycheck Protection Program CARES Act [Member]            
Proceeds from Issuance of Long-term Debt, Total   $ 2,815,200        
Debt Instrument, Term (Year)   2 years        
Debt Instrument, Interest Rate, Stated Percentage   1.00%        
Debt Instrument, Decrease, Forgiveness $ 2,800,000          
Gain (Loss) on Extinguishment of Debt, Total         $ 2,800,000