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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue $ 4,016,563 $ 4,641,483 $ 8,014,440 $ 14,923,327
Reportable Geographical Components [Member] | US And Canada [Member]        
Revenue 195,611 307,480 361,199 433,962
Reportable Geographical Components [Member] | AUSTRALIA        
Revenue 235,157 61,706 259,851 103,961
Reportable Geographical Components [Member] | South America [Member]        
Revenue 596 12,043 596 22,939
Reportable Geographical Components [Member] | Asia [Member]        
Revenue 1,223,875 292,756 2,329,217 2,326,044
Reportable Geographical Components [Member] | Europe [Member]        
Revenue $ 2,361,324 $ 3,967,498 $ 5,063,577 $ 12,036,421