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Note 3 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, |
|  | 2023 |  |  | 2022 |
Cash |  | $ | 10,196 |  |  | $ | 5,634 |
Restricted cash |  |  | 82 |  |  |  | 79 |
Total |  | $ | 10,278 |  |  | $ | 5,713 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 2023 |  |  | 2022 |
Raw materials |  | $ | 29,098 |  |  | $ | 29,200 |
Work in process |  |  | 3,187 |  |  |  | 2,757 |
Finished products |  |  | 9,930 |  |  |  | 9,235 |
Total |  | $ | 42,215 |  |  | $ | 41,192 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2023 |  |  | 2022 |
Land |  | $ | 1,273 |  |  | $ | 1,273 |
Buildings and leasehold improvements |  |  | 15,998 |  |  |  | 15,572 |
Machinery and equipment |  |  | 57,584 |  |  |  | 63,981 |
Furniture and fixtures |  |  | 2,845 |  |  |  | 2,845 |
Computer hardware and software |  |  | 7,868 |  |  |  | 7,744 |
Construction in progress |  |  | 2,033 |  |  |  | 1,245 |
|  |  | 87,601 |  |  |  | 92,660 |
Less: Accumulated depreciation |  |  | (66,484 | ) |  |  | (70,944 | )
Total |  | $ | 21,117 |  |  | $ | 21,716 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communications Systems |  |  | Total |
Balance – January 1, 2023 |  | $ | 25,935 |  |  | $ | 11,493 |  |  | $ | 37,428 |
Effect of foreign currency translation |  |  | 143 |  |  |  | - |  |  |  | 143 |
Balance – December 31, 2023 |  | $ | 26,078 |  |  | $ | 11,493 |  |  | $ | 37,571 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2023 |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Customer relationships |  | $ | 13,092 |  |  | $ | 6,656 |  |  | $ | 6,436 |
Patents and technology |  |  | 5,606 |  |  |  | 5,322 |  |  |  | 284 |
Trade names |  |  | 4,647 |  |  |  | 647 |  |  |  | 4,000 |
Trademarks |  |  | 3,402 |  |  |  | - |  |  |  | 3,402 |
Other |  |  | 1,500 |  |  |  | 515 |  |  |  | 985 |
Total other intangible assets |  | $ | 28,247 |  |  | $ | 13,140 |  |  | $ | 15,107 |
|  | December 31, 2022 |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Customer relationships |  | $ | 12,970 |  |  | $ | 5,992 |  |  | $ | 6,978 |
Patents and technology |  |  | 5,557 |  |  |  | 5,171 |  |  |  | 386 |
Trade names |  |  | 4,629 |  |  |  | 522 |  |  |  | 4,107 |
Trademarks |  |  | 3,404 |  |  |  | - |  |  |  | 3,404 |
Other |  |  | 1,500 |  |  |  | 454 |  |  |  | 1,046 |
Total other intangible assets |  | $ | 28,060 |  |  | $ | 12,139 |  |  | $ | 15,921 |
Finite-Lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 2023 |  |  | 2022 |
Research and development expense |  | $ | 97 |  |  | $ | 97 |
Selling, general and administrative expense |  |  | 792 |  |  |  | 1,185 |
Total |  | $ | 889 |  |  | $ | 1,282 |

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