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Note 3 - Acquisitions - Fair Value of Assets Acquired (Details) - USD ($) | Dec. 31, 2022 | Nov. 09, 2022 | Dec. 31, 2021 | May 31, 1988
--- | --- | --- | --- | ---
Goodwill | $ 5,714,000 |  | $ 3,813,000 | $ 7,006,000
ATEC Acquisition [Member] |  |  |  |
Inventory |  | $ 80,000 |  |
Property, plant and equipment |  | 169,000 |  |
Identifiable intangibles |  | 50,000 |  |
Goodwill |  | 1,901,000 |  |
Total estimated purchase price |  | $ 2,200,000 |  |

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