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Note 10 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Product sales, net $ 2,215,699 $ 2,108,233 $ 6,564,969 $ 7,458,678  
Operating Income (Loss) (2,013,495) (1,980,921) (6,812,856) (5,837,866)  
Depreciation and Amortization 16,661 16,353 50,121 52,113  
Income (loss) before taxes and equity in earnings of affiliates (1,985,483) (1,985,529) (6,786,037) (5,573,290)  
Total assets 15,278,459   15,278,459   $ 19,809,744
Corporate, Non-Segment [Member]          
Operating Income (Loss) (1,384,940) (1,236,297) (3,850,189) (4,713,353)  
Depreciation and Amortization 14,691 14,220 44,328 42,398  
Income (loss) before taxes and equity in earnings of affiliates (1,354,219) (1,238,191) (3,815,071) (4,515,976)  
Total assets 10,331,332   10,331,332   12,273,064
Dental Segment [Member]          
Product sales, net 2,206,499 2,076,233 6,509,619 7,334,628  
Dental Segment [Member] | Operating Segments [Member]          
Product sales, net 2,206,499 2,076,233 6,509,619 7,334,628  
Operating Income (Loss) 308,913 193,252 826,175 1,844,083  
Depreciation and Amortization 951 892 2,737 3,458  
Income (loss) before taxes and equity in earnings of affiliates 307,699 191,864 822,270 1,915,148  
Total assets 4,083,657   4,083,657   6,163,169
Medical Segment [Member]          
Product sales, net 9,200 32,000 55,350 124,050  
Medical Segment [Member] | Operating Segments [Member]          
Product sales, net 9,200 32,000 55,350 124,050  
Operating Income (Loss) (937,468) (937,876) (3,788,842) (2,968,596)  
Depreciation and Amortization 1,019 1,241 3,056 6,257  
Income (loss) before taxes and equity in earnings of affiliates (938,963) $ (939,202) (3,793,236) $ (2,972,462)  
Total assets $ 863,470   $ 863,470   $ 1,373,511