Note 4 - Inventories (Details Textual) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Inventory Valuation Reserves, Ending Balance	$ 754,000	$ 763,000
Slow Moving Medical Finished Goods [Member]
Inventory Valuation Reserves, Ending Balance	452,120	454,183
Slow Moving Dental Finished Goods [Member]
Inventory Valuation Reserves, Ending Balance	$ 302,073	$ 309,196

Amount of valuation reserve for inventory.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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