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Note 3 - Leases (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating Lease, Expense $ 116,535 $ 61,049 $ 220,666 $ 128,693