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Note 4 - Revenue From Contracts With Customers (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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