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Note 5 - Supplemental Balance Sheet Information (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Raw materials |  | $ | 35,502 |  |  | $ | 36,035 |
Work in process |  |  | 5,639 |  |  |  | 4,501 |
Finished goods |  |  | 9,434 |  |  |  | 10,827 |
Total |  | $ | 50,575 |  |  | $ | 51,363 |
Property, Plant and Equipment [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Land |  | $ | 4,693 |  |  | $ | 4,693 |
Buildings and leasehold improvements |  |  | 30,124 |  |  |  | 30,109 |
Machinery and equipment |  |  | 62,012 |  |  |  | 60,986 |
Furniture and fixtures |  |  | 3,108 |  |  |  | 3,067 |
Computer hardware and software |  |  | 8,090 |  |  |  | 7,990 |
Construction in process |  |  | 3,122 |  |  |  | 2,077 |
|  |  | 111,149 |  |  |  | 108,922 |
Less: Accumulated depreciation |  |  | (70,535 | ) |  |  | (68,437 | )
Property, plant and equipment, net |  | $ | 40,614 |  |  | $ | 40,485 |
Schedule of Depreciation Expense [Table Text Block] |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Depreciation expense |  | $ | 1,008 |  |  | $ | 789 |  |  | $ | 1,958 |  |  | $ | 1,529 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy |  |  | Communications |  |  |  |  |
|  | Products |  |  | Systems |  |  | Total |
Balance – December 31, 2024 |  | $ | 33,513 |  |  | $ | 11,493 |  |  | $ | 45,006 |
Effect of foreign currency translation |  |  | 400 |  |  |  | - |  |  |  | 400 |
Balance – June 30, 2025 |  | $ | 33,913 |  |  | $ | 11,493 |  |  | $ | 45,406 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | at June 30, 2025 |
|  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Net |
Customer relationships |  | $ | 18,383 |  |  | $ | 7,913 |  |  | $ | 10,470 |
Trade names |  |  | 9,976 |  |  |  | 1,078 |  |  |  | 8,898 |
Patents and technology |  |  | 5,783 |  |  |  | 5,583 |  |  |  | 200 |
Trademarks |  |  | 3,400 |  |  |  | - |  |  |  | 3,400 |
Other |  |  | 1,500 |  |  |  | 629 |  |  |  | 871 |
Total other intangible assets |  | $ | 39,042 |  |  | $ | 15,203 |  |  | $ | 23,839 |
|  | at December 31, 2024 |
|  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | 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 |
Finite-Lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Amortization included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  | $ | 378 |  |  | $ | 202 |  |  | $ | 754 |  |  | $ | 405 |
Research and development |  |  | 32 |  |  |  | 25 |  |  |  | 61 |  |  |  | 50 |
Total amortization expense |  | $ | 410 |  |  | $ | 227 |  |  | $ | 815 |  |  | $ | 455 |

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