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Note 5 - Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Property and equipment, gross $ 769,345 $ 707,159
Accumulated depreciation and amortization (562,490) (550,221)
Property and equipment, net 206,855 156,938
Equipment and Furnishings [Member]    
Property and equipment, gross 653,740 591,554
Leasehold Improvements [Member]    
Property and equipment, gross $ 115,605 $ 115,605