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Note 1 - Summary of Significant Accounting Policies - Net Sales by Geographical Region (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Sales $ 4,641,483 $ 9,297,186 $ 14,923,327 $ 16,718,384
Reportable Geographical Components [Member] | US And Canada [Member]        
Net Sales 307,480 255,642 433,962 688,229
Reportable Geographical Components [Member] | AUSTRALIA        
Net Sales 61,706 153,401 103,961 215,514
Reportable Geographical Components [Member] | South America [Member]        
Net Sales 12,043 0 22,939 0
Reportable Geographical Components [Member] | Asia [Member]        
Net Sales 292,756 933,693 2,326,044 2,172,807
Reportable Geographical Components [Member] | Europe [Member]        
Net Sales $ 3,967,498 $ 7,954,450 $ 12,036,421 $ 13,641,834