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Note 6 - Property and Equipment - Property and Equipment (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Property, plant and equipment, gross $ 603,410 $ 614,564
Accumulated depreciation (579,923) (574,071)
Property, plant and equipment, net 23,487 40,493
Computer Equipment [Member]    
Property, plant and equipment, gross 139,769 140,775
Office Equipment [Member]    
Property, plant and equipment, gross 66,644 70,814
Website Development Costs [Member]    
Property, plant and equipment, gross $ 396,997 $ 402,975