Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details)

v3.20.2
Note 11 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Product sales, net $ 1,246,110 $ 1,899,821 $ 3,225,170 $ 6,073,580
Dental Segment [Member]        
Product sales, net 1,240,110 1,884,321 3,209,370 6,042,580
Medical Segment [Member]        
Product sales, net 6,000 15,500 15,800 31,000
Domestic [Member]        
Product sales, net 408,129 896,890 1,067,133 2,721,779
Domestic [Member] | Devices [Member]        
Product sales, net 34,657 199,926 35,181 409,529
Domestic [Member] | Handpieces [Member]        
Product sales, net 356,566 679,621 994,057 2,250,842
Domestic [Member] | Other Products [Member]        
Product sales, net 16,906 17,343 37,895 61,408
Domestic [Member] | Dental Segment [Member]        
Product sales, net 408,129 896,890 1,065,133 2,710,679
Domestic [Member] | Dental Segment [Member] | Devices [Member]        
Product sales, net 34,657 199,926 35,181 398,729
Domestic [Member] | Dental Segment [Member] | Handpieces [Member]        
Product sales, net 356,566 679,621 992,057 2,250,542
Domestic [Member] | Dental Segment [Member] | Other Products [Member]        
Product sales, net 16,906 17,343 37,895 61,408
Domestic [Member] | Medical Segment [Member]        
Product sales, net 2,000 11,100
Domestic [Member] | Medical Segment [Member] | Devices [Member]        
Product sales, net 10,800
Domestic [Member] | Medical Segment [Member] | Handpieces [Member]        
Product sales, net 2,000 300
Domestic [Member] | Medical Segment [Member] | Other Products [Member]        
Product sales, net
Rest of World [Member]        
Product sales, net     2,158,037 3,251,801
Rest of World [Member] | Devices [Member]        
Product sales, net 220,694 412,819 502,598 1,108,488
Rest of World [Member] | Handpieces [Member]        
Product sales, net 608,000 579,765 1,624,724 2,040,250
Rest of World [Member] | Other Products [Member]        
Product sales, net 9,287 10,347 30,715 103,063
Rest of World [Member] | Dental Segment [Member]        
Product sales, net     2,144,237 3,231,901
Rest of World [Member] | Dental Segment [Member] | Devices [Member]        
Product sales, net 220,694 412,819 494,998 1,100,488
Rest of World [Member] | Dental Segment [Member] | Handpieces [Member]        
Product sales, net 602,000 564,265 1,618,524 2,028,750
Rest of World [Member] | Dental Segment [Member] | Other Products [Member]        
Product sales, net 9,287 10,347 30,715 102,663
Rest of World [Member] | Medical Segment [Member]        
Product sales, net     13,800 19,900
Rest of World [Member] | Medical Segment [Member] | Devices [Member]        
Product sales, net 7,600 8,000
Rest of World [Member] | Medical Segment [Member] | Handpieces [Member]        
Product sales, net 6,000 15,500 6,200 11,500
Rest of World [Member] | Medical Segment [Member] | Other Products [Member]        
Product sales, net 400
International [Member]        
Product sales, net 837,981 1,002,931    
International [Member] | Dental Segment [Member]        
Product sales, net 831,981 987,431    
International [Member] | Medical Segment [Member]        
Product sales, net 6,000 15,500    
CHINA        
Product sales, net 100,000
CHINA | Devices [Member]        
Product sales, net
CHINA | Handpieces [Member]        
Product sales, net 100,000
CHINA | Other Products [Member]        
Product sales, net
CHINA | Dental Segment [Member]        
Product sales, net 100,000
CHINA | Dental Segment [Member] | Devices [Member]        
Product sales, net
CHINA | Dental Segment [Member] | Handpieces [Member]        
Product sales, net 100,000
CHINA | Dental Segment [Member] | Other Products [Member]        
Product sales, net
CHINA | Medical Segment [Member]        
Product sales, net
CHINA | Medical Segment [Member] | Devices [Member]        
Product sales, net
CHINA | Medical Segment [Member] | Handpieces [Member]        
Product sales, net
CHINA | Medical Segment [Member] | Other Products [Member]        
Product sales, net