Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Inventories - Summary of Inventories (Details)

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Note 4 - Inventories - Summary of Inventories (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Component parts and other materials $ 81,544 $ 123,918
Total inventories 1,270,480 1,921,051
Dental Segment [Member]    
Finished goods, net 1,035,167 1,609,000
Medical Segment [Member]    
Finished goods, net $ 153,769 $ 188,133