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Note E - Inventories - Summary of Inventories (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Component parts and other materials $ 57,652 $ 35,383
Total 3,379,209 4,602,719
Dental Segment [Member]    
Finished goods 2,846,272 3,832,275
Medical Segment [Member]    
Finished goods $ 475,285 $ 735,061