Note 5 - Inventories - Summary of Inventories (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Component parts and other materials	$ 178,355	$ 57,652
Total	2,310,330	3,379,209
Dental Segment [Member]
Dental finished goods, net	1,922,647	2,846,272
Medical Segment [Member]
Dental finished goods, net	$ 209,328	$ 475,285

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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