Note 10 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Product sales, net	$ 1,899,821	$ 1,622,246	$ 6,073,580	$ 5,856,351
Operating Income (Loss)	(946,734)	(4,547,581)	(2,872,749)	(7,973,924)
Depreciation and Amortization	25,418	344,984	76,919	855,101
Income (loss) before taxes and equity in earnings of affiliates	(2,848,667)	(4,547,821)	(4,725,577)	(7,973,028)
Dental	6,242,520		6,242,520		$ 6,400,968
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,036,541)	(3,200,126)	(2,927,655)	(6,084,685)
Depreciation and Amortization	19,044	338,565	57,620	821,084
Income (loss) before taxes and equity in earnings of affiliates	(2,937,140)	(3,133,819)	(4,777,693)	(6,088,167)
Dental	983,631		983,631		902,816
Dental Segment [Member] \| Operating Segments [Member]
Product sales, net	1,884,321	1,622,246	6,042,580	5,780,251
Operating Income (Loss)	644,650	(893,148)	1,766,087	119,613
Depreciation and Amortization	3,950	3,889	11,875	12,133
Income (loss) before taxes and equity in earnings of affiliates	645,442	(959,095)	1,765,475	125,734
Dental	4,745,889		4,745,889		5,169,944
Medical Segment [Member] \| Operating Segments [Member]
Product sales, net	15,500		31,000	76,100
Operating Income (Loss)	(554,843)	(454,306)	(1,711,184)	(2,008,852)
Depreciation and Amortization	2,424	2,530	7,424	21,884
Income (loss) before taxes and equity in earnings of affiliates	(556,969)	$ (454,906)	(1,713,362)	$ (2,010,595)
Dental	$ 513,000		$ 513,000		$ 328,208

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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