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Note 1 - Summary of Significant Accounting Policies - Net Sales by Geographical Region (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue, Percentage 100.00% 100.00%
Revenue $ 3,637,236 $ 3,997,877
Reportable Geographical Components [Member] | North America [Member]    
Revenue, Percentage 4.00% 4.00%
Revenue $ 139,307 $ 165,588
Reportable Geographical Components [Member] | AUSTRALIA    
Revenue, Percentage 1.00% 1.00%
Revenue $ 35,399 $ 32,141
Reportable Geographical Components [Member] | Asia [Member]    
Revenue, Percentage 22.00% 28.00%
Revenue $ 799,965 $ 1,157,155
Reportable Geographical Components [Member] | Europe [Member]    
Revenue, Percentage 73.00% 67.00%
Revenue $ 2,662,564 $ 2,642,993