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Note 3 - Leases (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lessee, Operating Lease, Term of Contract (Month) 4 years 30 days  
Operating Lease, Weighted Average Discount Rate, Percent 5.50%  
Operating Lease, Expense $ 26,122 $ 26,122