Note H - Intangible Assets - Summary of Intangible Assets (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Gross carrying amount	$ 347,946	$ 287,248
Accumulated amortization	(166,842)	(153,116)
Net carrying amount	181,104	134,132
Patents [Member]
Gross carrying amount	347,946	287,248
Accumulated amortization	(166,842)	(153,116)
Net carrying amount	$ 181,104	$ 134,132

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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