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Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Product sales, net	$ 1,899,821	$ 1,622,246	$ 6,073,580	$ 5,856,351
Product sales, net	1,899,821	1,622,246	6,073,580	5,856,351
Domestic [Member]
Product sales, net	1,047,180	509,254	3,186,287	2,620,541
Product sales, net	1,047,180	509,254	3,186,287	2,620,541
Domestic [Member] | Devices [Member]
Product sales, net	216,076	119,190	486,360	251,743
Product sales, net	216,076	119,190	486,360	251,743
Domestic [Member] | Handpieces [Member]
Product sales, net	812,655	369,027	2,632,199	2,296,533
Product sales, net	812,655	369,027	2,632,199	2,296,533
Domestic [Member] | Other Products [Member]
Product sales, net	18,449	21,037	67,728	72,265
Product sales, net	18,449	21,037	67,728	72,265
Rest of World [Member]
Product sales, net	852,641	812,992	2,787,293	2,935,810
Product sales, net	852,641	812,992	2,787,293	2,935,810
Rest of World [Member] | Devices [Member]
Product sales, net	391,768	299,872	1,016,683	952,390
Product sales, net	391,768	299,872	1,016,683	952,390
Rest of World [Member] | Handpieces [Member]
Product sales, net	451,631	506,880	1,714,471	1,924,901
Product sales, net	451,631	506,880	1,714,471	1,924,901
Rest of World [Member] | Other Products [Member]
Product sales, net	9,242	6,240	56,139	58,519
Product sales, net	9,242	6,240	56,139	58,519
CHINA
Product sales, net		300,000	100,000	300,000
Product sales, net		300,000	100,000	300,000
CHINA | Devices [Member]
Product sales, net
Product sales, net
CHINA | Handpieces [Member]
Product sales, net		300,000	100,000	300,000
Product sales, net		300,000	100,000	300,000
CHINA | Other Products [Member]
Product sales, net
Product sales, net

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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