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Note 4 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, |
|  | 2024 |  |  | 2023 |
Cash |  | $ | 6,854 |  |  | $ | 10,196 |
Restricted cash |  |  | - |  |  |  | 82 |
Total |  | $ | 6,854 |  |  | $ | 10,278 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 2024 |  |  | 2023 |
Raw materials |  | $ | 36,035 |  |  | $ | 29,098 |
Work in process |  |  | 4,501 |  |  |  | 3,187 |
Finished products |  |  | 10,827 |  |  |  | 9,930 |
Total |  | $ | 51,363 |  |  | $ | 42,215 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2024 |  |  | 2023 |
Land |  | $ | 4,693 |  |  | $ | 1,273 |
Buildings and leasehold improvements |  |  | 30,109 |  |  |  | 15,998 |
Machinery and equipment |  |  | 60,986 |  |  |  | 57,584 |
Furniture and fixtures |  |  | 3,067 |  |  |  | 2,845 |
Computer hardware and software |  |  | 7,990 |  |  |  | 7,868 |
Construction in progress |  |  | 2,077 |  |  |  | 2,033 |
|  |  | 108,922 |  |  |  | 87,601 |
Less: Accumulated depreciation |  |  | (68,437 | ) |  |  | (66,484 | )
Total |  | $ | 40,485 |  |  | $ | 21,117 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communications Systems |  |  | Total |
Balance – January 1, 2024 |  | $ | 26,078 |  |  | $ | 11,493 |  |  | $ | 37,571 |
Acquisition of Electrochem |  |  | 7,558 |  |  |  | - |  |  |  | 7,558 |
Effect of foreign currency translation |  |  | (123 | ) |  |  | - |  |  |  | (123 | )
Balance – December 31, 2024 |  | $ | 33,513 |  |  | $ | 11,493 |  |  | $ | 45,006 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2024 |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Customer relationships |  | $ | 18,154 |  |  | $ | 7,296 |  |  | $ | 10,858 |
Trade names |  |  | 9,942 |  |  |  | 813 |  |  |  | 9,129 |
Patents and technology |  |  | 5,690 |  |  |  | 5,428 |  |  |  | 262 |
Trademarks |  |  | 3,399 |  |  |  | - |  |  |  | 3,399 |
Other |  |  | 1,500 |  |  |  | 591 |  |  |  | 909 |
Total other intangible assets |  | $ | 38,685 |  |  | $ | 14,128 |  |  | $ | 24,557 |
|  | December 31, 2023 |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Customer relationships |  | $ | 13,092 |  |  | $ | 6,656 |  |  | $ | 6,436 |
Trade names |  |  | 4,647 |  |  |  | 647 |  |  |  | 4,000 |
Patents and technology |  |  | 5,606 |  |  |  | 5,322 |  |  |  | 284 |
Trademarks |  |  | 3,402 |  |  |  | - |  |  |  | 3,402 |
Other |  |  | 1,500 |  |  |  | 515 |  |  |  | 985 |
Total other intangible assets |  | $ | 28,247 |  |  | $ | 13,140 |  |  | $ | 15,107 |
Finite-Lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 2024 |  |  | 2023 |
Selling, general and administrative expense |  | $ | 929 |  |  | $ | 792 |
Research and development expense |  |  | 103 |  |  |  | 97 |
Total |  | $ | 1,032 |  |  | $ | 889 |

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