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Note 1 - Nature of Operations (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Apr. 10, 2020 USD ($)
Number of Operating Segments | 2 |  |
Net Income (Loss) Attributable to Parent, Total | $ (1,143) | $ 1,138 |
Revenue from Contract with Customer, Including Assessed Tax | 11,230 | 18,062 |
Subsequent Event [Member] | M&T [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 7,500
Semiconductor Market [Member] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 5,011 | $ 10,111 |

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