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Note 5 - Debt (Details Textual) - USD ($)
Oct. 22, 2021
Dec. 21, 2020
Dec. 31, 2021
Feb. 08, 2021
Dec. 31, 2020
Apr. 14, 2020
Feb. 29, 2020
SBA CARES Act Paycheck Protection Program [Member]              
Debt Instrument, Face Amount       $ 473,400   $ 473,400  
Debt Instrument, Decrease, Forgiveness $ 473,400 $ 473,400          
Revolving Credit Facility [Member] | General Credit Agreement [Member]              
Line of Credit Facility, Maximum Borrowing Capacity             $ 500,000
Long-term Line of Credit, Total     $ 0   $ 0    
Debt Instrument, Prime Rate Floor     3.75%