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Patents and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Patents and other intangible assets are summarized as follows

		March 31,			December 31,
		2018			2017
		(unaudited)
Patents
Patents pending		$	1,234,000		$	1,167,000
Issued patents			966,000			930,000
			2,200,000			2,097,000
Trademarks
Trademarks pending			44,000			41,000
Registered trademarks			23,000			23,000
			67,000			64,000
Other			8,000			8,000
			2,275,000			2,169,000
Accumulated amortization			(372,000)			(313,000)
		$	1,903,000		$	1,856,000

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Future amortization expense associated with issued patents and registered trademarks as of March 31, 2018 is estimated as follows:

2018		$	177,000
2019			215,000
2020			129,000
2021			54,000
2022			23,000
Thereafter			19,000
		$	617,000