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Note 4 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Cash |  | $ | 5,634 |  |  | $ | 8,329 |
Restricted cash |  |  | 79 |  |  |  | 84 |
Total |  | $ | 5,713 |  |  | $ | 8,413 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Raw materials |  | $ | 29,200 |  |  | $ | 21,660 |
Work in process |  |  | 2,757 |  |  |  | 4,227 |
Finished products |  |  | 9,235 |  |  |  | 7,302 |
Total |  | $ | 41,192 |  |  | $ | 33,189 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Land |  | $ | 1,759 |  |  | $ | 1,273 |
Buildings and leasehold improvements |  |  | 15,572 |  |  |  | 15,442 |
Machinery and equipment |  |  | 63,495 |  |  |  | 63,780 |
Furniture and fixtures |  |  | 2,845 |  |  |  | 2,588 |
Computer hardware and software |  |  | 7,744 |  |  |  | 7,579 |
Construction in progress |  |  | 1,245 |  |  |  | 761 |
|  |  | 92,660 |  |  |  | 91,423 |
Less – Accumulated depreciation |  |  | (70,944 | ) |  |  | (68,218 | )
Total |  | $ | 21,716 |  |  | $ | 23,205 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communications Systems |  |  | Total |
Balance – January 1, 2022 |  | $ | 26,575 |  |  | $ | 11,493 |  |  | $ | 38,068 |
Effect of foreign currency translation |  |  | (640 | ) |  |  | - |  |  |  | (640 | )
Balance – December 31, 2022 |  | $ | 25,935 |  |  | $ | 11,493 |  |  | $ | 37,428 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 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 |
|  | December 31, 2021, |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Customer relationships |  | $ | 13,214 |  |  | $ | 5,484 |  |  | $ | 7,730 |
Patents and technology |  |  | 5,667 |  |  |  | 5,126 |  |  |  | 541 |
Trade names |  |  | 4,670 |  |  |  | 436 |  |  |  | 4,234 |
Trademarks |  |  | 3,413 |  |  |  | - |  |  |  | 3,413 |
Other |  |  | 1,490 |  |  |  | 18 |  |  |  | 1,472 |
Total other intangible assets |  | $ | 28,454 |  |  | $ | 11,064 |  |  | $ | 17,390 |
Finite-Lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 2022 |  |  | 2021 |
Research and development expense |  | $ | 97 |  |  | $ | 118 |
Selling, general and administrative expense |  |  | 1,185 |  |  |  | 515 |
Total |  | $ | 1,282 |  |  | $ | 633 |

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