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Note 3 - Leases (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Operating Lease, Term of Contract (Month) 4 years 30 days  
Operating Lease, Weighted Average Discount Rate, Percent 5.50%  
Operating Lease, Expense $ 104,487 $ 104,487