Note 4 - Revenue From Contracts With Customers (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Years Ended December 31,
	2019		2018
Net revenues by customer type:
End user	$	55,074	$	68,093
OEM/Integrator		5,586		10,470
	$	60,660	$	78,563
Net revenues by product type:
Thermal test	$	17,631	$	23,654
Thermal process		20,079		25,739
Semiconductor test		16,273		21,445
Service/other		6,677		7,725
	$	60,660	$	78,563
Net revenues by market:
Semi	$	30,953	$	45,378
Industrial		21,231		21,220
Defense/aerospace		4,842		4,943
Telecommunications		1,845		5,574
Other Multimarket		1,789		1,448
	$	60,660	$	78,563

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

Balance - January 1, 2018	$	213
Bad debt expense		20
Write-offs		-
Balance - December 31, 2018		233
Bad debt expense		3
Write-offs		(25	)
Balance - December 31, 2019	$	211