Note 5 - Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Goodwill [Table Text Block]

	Sigma		Thermonics		Ambrell		Total
Balance - January 1, 2017	$	1,656	$	50	$	-	$	1,706
Acquisition of Ambrell		-		-		12,032		12,032
Balance - December 31, 2017	$	1,656	$	50	$	12,032	$	13,738

Schedule of Carrying Value of Finite-lived Intangible Assets [Table Text Block]

Balance - January 1, 2017	$	365
Acquisition of Ambrell		10,100
Amortization		(1,161	)
Balance - December 31, 2017	$	9,304

Schedule Of Intangible Assets [Table Text Block]

	December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived intangible assets:
Customer relationships	$	10,480	$	1,828	$	8,652
Technology		600		95		505
Patents		590		463		127
Software		270		250		20
Trade name		140		140		-
Customer backlog		500		500		-
Total finite-lived intangible assets		12,580		3,276		9,304
Indefinite-lived intangible assets:
Trademarks		6,710		-		6,710
Total intangible assets	$	19,290	$	3,276	$	16,014

	December 31, 2016
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived intangible assets:
Customer relationships	$	1,480	$	1,328	$	152
Patents		590		424		166
Software		270		223		47
Trade name		140		140		-
Total finite-lived intangible assets		2,480		2,115		365
Indefinite-lived intangible assets:
Sigma trademark		510		-		510
Total intangible assets	$	2,990	$	2,115	$	875

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

2018	$	1,102
2019	$	1,257
2020	$	1,234
2021	$	1,227
2022	$	1,167