Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details)

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Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Product sales, net $ 1,915,909 $ 1,805,605
Domestic [Member]    
Product sales, net 930,764 918,430
Domestic [Member] | Devices [Member]    
Product sales, net 123,994 121,048
Domestic [Member] | Handpieces [Member]    
Product sales, net 789,553 768,531
Domestic [Member] | Other Products [Member]    
Product sales, net 16,817 28,851
Rest of World [Member]    
Product sales, net 935,545 887,175
Rest of World [Member] | Devices [Member]    
Product sales, net 285,345 279,468
Rest of World [Member] | Handpieces [Member]    
Product sales, net 631,311 582,827
Rest of World [Member] | Other Products [Member]    
Product sales, net 18,889 24,880
CHINA    
Product sales, net 50,000
CHINA | Devices [Member]    
Product sales, net
CHINA | Handpieces [Member]    
Product sales, net 50,000
CHINA | Other Products [Member]    
Product sales, net
Dental Segment [Member]    
Product sales, net 1,915,509 1,769,105
Dental Segment [Member] | Domestic [Member]    
Product sales, net 929,964 918,430
Dental Segment [Member] | Domestic [Member] | Devices [Member]    
Product sales, net 123,994 121,048
Dental Segment [Member] | Domestic [Member] | Handpieces [Member]    
Product sales, net 789,153 768,531
Dental Segment [Member] | Domestic [Member] | Other Products [Member]    
Product sales, net 16,817 28,851
Dental Segment [Member] | Rest of World [Member]    
Product sales, net 935,545 850,675
Dental Segment [Member] | Rest of World [Member] | Devices [Member]    
Product sales, net 285,345 246,968
Dental Segment [Member] | Rest of World [Member] | Handpieces [Member]    
Product sales, net 631,311 578,827
Dental Segment [Member] | Rest of World [Member] | Other Products [Member]    
Product sales, net 18,889 24,880
Dental Segment [Member] | CHINA    
Product sales, net 50,000
Dental Segment [Member] | CHINA | Devices [Member]    
Product sales, net
Dental Segment [Member] | CHINA | Handpieces [Member]    
Product sales, net 50,000
Dental Segment [Member] | CHINA | Other Products [Member]    
Product sales, net
Medical Segment [Member]    
Product sales, net 400 36,500
Medical Segment [Member] | Domestic [Member]    
Product sales, net 400
Medical Segment [Member] | Domestic [Member] | Devices [Member]    
Product sales, net
Medical Segment [Member] | Domestic [Member] | Handpieces [Member]    
Product sales, net 400
Medical Segment [Member] | Domestic [Member] | Other Products [Member]    
Product sales, net
Medical Segment [Member] | Rest of World [Member]    
Product sales, net 36,500
Medical Segment [Member] | Rest of World [Member] | Devices [Member]    
Product sales, net 32,500
Medical Segment [Member] | Rest of World [Member] | Handpieces [Member]    
Product sales, net 4,000
Medical Segment [Member] | Rest of World [Member] | Other Products [Member]    
Product sales, net
Medical Segment [Member] | CHINA    
Product sales, net
Medical Segment [Member] | CHINA | Devices [Member]    
Product sales, net
Medical Segment [Member] | CHINA | Handpieces [Member]    
Product sales, net
Medical Segment [Member] | CHINA | Other Products [Member]    
Product sales, net