Note 5 - Revenue From Contracts With Customers (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Years Ended December 31,
	2020		2019
Net revenues by customer type:
End user	$	48,041	$	55,074
OEM/Integrator		5,782		5,586
	$	53,823	$	60,660
Net revenues by product type:
Thermal test	$	15,768	$	17,631
Thermal process		18,966		20,079
Semiconductor test		13,112		16,273
Service/other		5,977		6,677
	$	53,823	$	60,660
Net revenues by market:
Semi Market	$	26,870	$	30,953
Industrial		17,341		21,231
Defense/aerospace		6,314		4,842
Telecommunications		1,715		1,845
Other Multi Markets		1,583		1,789
	$	53,823	$	60,660

Schedule of Changes in Allowance for Doubtful Accounts Receivable [Table Text Block]

Balance - January 1, 2019	$	233
Bad debt expense		3
Write-offs		(25	)
Balance - December 31, 2019		211
Bad debt expense		-
Write-offs		-
Foreign currency translation adjustments		1
Balance - December 31, 2020	$	212