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Note 12 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating Lease, Expense $ 14,700   $ 29,400  
Operating Lease, Weighted Average Remaining Lease Term (Year) 9 years 146 days   9 years 146 days  
Operating Lease, Weighted Average Discount Rate, Percent 11.30%   11.30%  
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year $ 40,200   $ 40,200  
Lessee, Operating Lease, Liability, to be Paid, Year One 19,400   19,400  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 15,400 $ 11,500 15,400 $ 11,500
Operating Lease, Payments $ 14,700 $ 14,200 $ 29,400 $ 28,200