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Note 11 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Product sales, net $ 2,108,233 $ 1,246,110 $ 7,458,678 $ 3,225,170
Dental Segment [Member]        
Product sales, net 2,076,233 1,240,110 7,334,628 3,209,370
Medical Segment [Member]        
Product sales, net 32,000 6,000 124,050 15,800
Domestic [Member]        
Product sales, net 790,382 408,129 2,788,083 1,067,133
Domestic [Member] | Dental Segment [Member]        
Product sales, net 778,882 408,129 2,768,433 1,065,133
Domestic [Member] | Medical Segment [Member]        
Product sales, net 11,500 0 19,650 2,000
Domestic [Member] | Instruments [Member]        
Product sales, net 36,480 34,657 391,250 35,181
Domestic [Member] | Instruments [Member] | Dental Segment [Member]        
Product sales, net 36,480 34,657 391,250 35,181
Domestic [Member] | Instruments [Member] | Medical Segment [Member]        
Product sales, net 0 0 0 0
Domestic [Member] | Handpieces [Member]        
Product sales, net 732,649 356,566 2,338,699 994,057
Domestic [Member] | Handpieces [Member] | Dental Segment [Member]        
Product sales, net 721,149 356,566 2,319,049 992,057
Domestic [Member] | Handpieces [Member] | Medical Segment [Member]        
Product sales, net 11,500 0 19,650 2,000
Domestic [Member] | Accessories [Member]        
Product sales, net 21,253 16,906 58,134 37,895
Domestic [Member] | Accessories [Member] | Dental Segment [Member]        
Product sales, net 21,253 16,906 58,134 37,895
Domestic [Member] | Accessories [Member] | Medical Segment [Member]        
Product sales, net 0 0 0
Rest of World [Member] | Instruments [Member]        
Product sales, net 257,563 220,694 855,403 502,598
Rest of World [Member] | Instruments [Member] | Dental Segment [Member]        
Product sales, net 253,063 220,694 792,903 494,998
Rest of World [Member] | Instruments [Member] | Medical Segment [Member]        
Product sales, net 4,500 0 62,500 7,600
Rest of World [Member] | Handpieces [Member]        
Product sales, net 690,133 608,000 2,379,592 1,624,724
Rest of World [Member] | Handpieces [Member] | Dental Segment [Member]        
Product sales, net 674,133 602,000 2,337,692 1,618,524
Rest of World [Member] | Handpieces [Member] | Medical Segment [Member]        
Product sales, net 16,000 6,000 41,900 6,200
Rest of World [Member] | Accessories [Member]        
Product sales, net 9,300 9,287 42,409 30,715
Rest of World [Member] | Accessories [Member] | Dental Segment [Member]        
Product sales, net 9,300 9,287 42,409 30,715
Rest of World [Member] | Accessories [Member] | Medical Segment [Member]        
Product sales, net 0 0 0
International [Member]        
Product sales, net 956,996 837,981 3,277,404 2,158,037
International [Member] | Dental Segment [Member]        
Product sales, net 936,496 831,981 3,173,004 2,144,237
International [Member] | Medical Segment [Member]        
Product sales, net 20,500 6,000 104,400 13,800
CHINA        
Product sales, net 360,855 0 1,393,191 0
CHINA | Dental Segment [Member]        
Product sales, net 360,855 0 1,393,191 0
CHINA | Medical Segment [Member]        
Product sales, net 0 0 0 0
CHINA | Instruments [Member]        
Product sales, net 0 0 228,000 0
CHINA | Instruments [Member] | Dental Segment [Member]        
Product sales, net 0 0 228,000 0
CHINA | Instruments [Member] | Medical Segment [Member]        
Product sales, net 0 0 0 0
CHINA | Handpieces [Member]        
Product sales, net 360,855 0 1,165,191 0
CHINA | Handpieces [Member] | Dental Segment [Member]        
Product sales, net 360,855 0 1,165,191 0
CHINA | Handpieces [Member] | Medical Segment [Member]        
Product sales, net 0 0 0 0
CHINA | Accessories [Member]        
Product sales, net 0 0 0 0
CHINA | Accessories [Member] | Dental Segment [Member]        
Product sales, net 0 0 0 0
CHINA | Accessories [Member] | Medical Segment [Member]        
Product sales, net $ 0 $ 0 $ 0 $ 0