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Note 1 - Summary of Significant Accounting Policies - Net Sales by Geographical Region (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net Sales $ 22,526,201 $ 32,637,484
Reportable Geographical Components [Member] | US And Canada [Member]    
Net Sales 656,032 1,600,298
Reportable Geographical Components [Member] | AUSTRALIA    
Net Sales 524,255 425,560
Reportable Geographical Components [Member] | Asia [Member]    
Net Sales 3,372,286 5,991,440
Reportable Geographical Components [Member] | Europe [Member]    
Net Sales $ 17,973,628 $ 24,620,186