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Note 4 - Revenue From Contracts With Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Net revenues | $ 14,352 | $ 21,097 | $ 32,414 | $ 39,968
Semiconductor Market [Member] |  |  |  |
Net revenues | 7,641 | 13,043 | 17,752 | 23,582
Industrial Market [Member] |  |  |  |
Net revenues | 4,279 | 5,000 | 10,225 | 10,653
Telecommunications Market [Member] |  |  |  |
Net revenues | 691 | 1,343 | 1,284 | 2,622
Other Non-semiconductors Markets [Member] |  |  |  |
Net revenues | 1,741 | 1,711 | 3,153 | 3,111
Thermal Testing Products [Member] |  |  |  |
Net revenues | 4,282 | 5,885 | 9,249 | 11,722
Induction Heating Products [Member] |  |  |  |
Net revenues | 4,321 | 5,937 | 10,072 | 11,559
Semiconductor Production Test Products [Member] |  |  |  |
Net revenues | 3,609 | 6,809 | 8,893 | 12,148
Service and Other Products [Member] |  |  |  |
Net revenues | 2,140 | 2,466 | 4,200 | 4,539
End User [Member] |  |  |  |
Net revenues | 13,106 | 18,173 | 29,143 | 34,502
OEM and Integrators [Member] |  |  |  |
Net revenues | $ 1,246 | $ 2,924 | $ 3,271 | $ 5,466

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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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