Note 5 - Intangible Assets

6 Months Ended

Jun. 30, 2019

Notes to Financial Statements

Business Combinations, Goodwill and Intangibles Disclosure [Text Block]

5.

Intangible Assets

Intangible assets as of

June 30, 2019

and

December 31, 2018

consisted of the following:

	Estimated useful lives (years)			June 30 , 2019			December 31, 2018
Tradename	5	to	7	$	555		$	555
Patents and technological know-how		10			15,653			13,377
Proprietary software	3	to	15		2,981			2,981
Other	3	to	5		323			323
Total intangible assets					19,512			17,236
Accumulated amortization					(7,641	)		(6,987	)
Total intangible assets, net				$	11,871		$	10,249

The amortization of intangible assets for the

three

and

six

months ended

June 30, 2019 

and

2018

 was as follows:

	Three months ended June 30,						Six months ended June 30,
	2019			2018			2019			2018
Amortization of intangible assets	$	(336	)	$	(265	)	$	(700	)	$	(513	)

The estimated future amortization expense of intangible assets is as follows:

Years ending December 31,	Amount
2019 (Remainder)	$	656
2020		1,175
2021		1,175
2022		1,175
2023		1,168
Thereafter		6,522
Total		11,871