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Note 4 - Revenue From Contracts With Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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