Annual report pursuant to Section 13 and 15(d)

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

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Note O - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Product sales, net $ 9,622,076 $ 11,281,886
Domestic [Member]    
Product sales, net 4,831,206 5,339,709
Domestic [Member] | Devices [Member]    
Product sales, net 523,875 914,495
Domestic [Member] | Handpieces [Member]    
Product sales, net 4,211,243 4,346,664
Domestic [Member] | Other Products [Member]    
Product sales, net 96,088 78,550
Rest of World [Member]    
Product sales, net 3,890,870 3,871,177
Rest of World [Member] | Devices [Member]    
Product sales, net 1,373,844 1,427,016
Rest of World [Member] | Handpieces [Member]    
Product sales, net 2,450,739 2,327,622
Rest of World [Member] | Other Products [Member]    
Product sales, net 66,287 116,539
CHINA    
Product sales, net 900,000 2,071,000
CHINA | Devices [Member]    
Product sales, net 109,374 643,600
CHINA | Handpieces [Member]    
Product sales, net 790,626 1,425,600
CHINA | Other Products [Member]    
Product sales, net 1,800
Dental Segment [Member]    
Product sales, net 9,502,276 11,279,886
Dental Segment [Member] | Domestic [Member]    
Product sales, net 4,798,706 5,339,709
Dental Segment [Member] | Domestic [Member] | Devices [Member]    
Product sales, net 491,375 914,495
Dental Segment [Member] | Domestic [Member] | Handpieces [Member]    
Product sales, net 4,211,243 4,346,664
Dental Segment [Member] | Domestic [Member] | Other Products [Member]    
Product sales, net 96,088 78,550
Dental Segment [Member] | Rest of World [Member]    
Product sales, net 3,803,570 3,869,177
Dental Segment [Member] | Rest of World [Member] | Devices [Member]    
Product sales, net 1,292,844 1,427,016
Dental Segment [Member] | Rest of World [Member] | Handpieces [Member]    
Product sales, net 2,444,639 2,325,622
Dental Segment [Member] | Rest of World [Member] | Other Products [Member]    
Product sales, net 66,087 116,539
Dental Segment [Member] | CHINA    
Product sales, net 900,000 2,071,000
Dental Segment [Member] | CHINA | Devices [Member]    
Product sales, net 109,374 643,600
Dental Segment [Member] | CHINA | Handpieces [Member]    
Product sales, net 790,626 1,425,600
Dental Segment [Member] | CHINA | Other Products [Member]    
Product sales, net 1,800
Medical Segment [Member]    
Product sales, net 119,800 2,000
Medical Segment [Member] | Domestic [Member]    
Product sales, net 32,500
Medical Segment [Member] | Domestic [Member] | Devices [Member]    
Product sales, net 32,500
Medical Segment [Member] | Domestic [Member] | Handpieces [Member]    
Product sales, net
Medical Segment [Member] | Domestic [Member] | Other Products [Member]    
Product sales, net
Medical Segment [Member] | Rest of World [Member]    
Product sales, net 87,300 2,000
Medical Segment [Member] | Rest of World [Member] | Devices [Member]    
Product sales, net 81,000
Medical Segment [Member] | Rest of World [Member] | Handpieces [Member]    
Product sales, net 6,100 2,000
Medical Segment [Member] | Rest of World [Member] | Other Products [Member]    
Product sales, net 200
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