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Note 1 - Summary of Significant Accounting Policies - Net Sales by Geographical Region (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net Sales $ 10,281,844 $ 7,421,198
Reportable Geographical Components [Member] | US And Canada [Member]    
Net Sales 126,482 113,059
Reportable Geographical Components [Member] | AUSTRALIA    
Net Sales 42,255 62,113
Reportable Geographical Components [Member] | South America [Member]    
Net Sales 10,896 319,528
Reportable Geographical Components [Member] | Asia [Member]    
Net Sales 2,033,288 1,239,113
Reportable Geographical Components [Member] | Europe [Member]    
Net Sales $ 8,068,923 $ 5,687,385