Note 4 - Revenue From Contracts With Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	[2]	Jun. 30, 2018	[3],[4]	Mar. 31, 2018	[5]	Dec. 31, 2019	Dec. 31, 2018
Net revenues	$ 13,614	$ 14,632	$ 14,352	$ 18,062	$ 18,435		$ 20,160		$ 21,097		$ 18,871		$ 60,660	$ 78,563
Semiconductor Market [Member]
Net revenues													30,953	45,378
Industrial Market [Member]
Net revenues													21,231	21,220
Defense/ Aerospace [Member]
Net revenues													4,842	4,943
Telecommunications Market [Member]
Net revenues													1,845	5,574
Other Non-semiconductors Markets [Member]
Net revenues													1,789	1,448
Thermal Testing Products [Member]
Net revenues													17,631	23,654
Thermal Process [Member]
Net revenues													20,079	25,739
Semiconductor Production Test Products [Member]
Net revenues													16,273	21,445
Service and Other Products [Member]
Net revenues													6,677	7,725
End User [Member]
Net revenues													55,074	68,093
OEM and Integrators [Member]
Net revenues													$ 5,586	$ 10,470

[1] The quarter ended December 31, 2018 includes a $2,828 increase in the fair value of contingent consideration, which was not deductible for tax purposes.

[2] The quarter ended September 30, 2018 includes $3,057 increase in the fair value of contingent consideration, which was not deductible for tax purposes.

[3] The quarter ended June 30, 2018 includes a $710 reduction in the fair value of contingent consideration, which was not taxable.

[4] The quarter ended June 30, 2018 includes the reversal of certain adjustments originally recorded in the quarter ended December 31, 2017 which were related to tax legislation enacted in December 2017, as discussed in Note 10.

[5] The quarter ended March 31, 2018 includes a $1,726 increase in the fair value of contingent consideration, which was not deductible for tax purposes.