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Note 4 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Cash |  | $ | 8,329 |  |  | $ | 10,562 |
Restricted cash |  |  | 84 |  |  |  | 91 |
Total |  | $ | 8,413 |  |  | $ | 10,653 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Raw materials |  | $ | 21,660 |  |  | $ | 17,277 |
Work in process |  |  | 4,227 |  |  |  | 3,411 |
Finished products |  |  | 7,302 |  |  |  | 7,505 |
Total |  | $ | 33,189 |  |  | $ | 28,193 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Land |  | $ | 1,273 |  |  | $ | 1,273 |
Buildings and leasehold improvements |  |  | 15,442 |  |  |  | 15,393 |
Machinery and equipment |  |  | 63,780 |  |  |  | 61,048 |
Furniture and fixtures |  |  | 2,588 |  |  |  | 2,235 |
Computer hardware and software |  |  | 7,579 |  |  |  | 6,894 |
Construction in progress |  |  | 761 |  |  |  | 1,227 |
|  |  | 91,423 |  |  |  | 88,070 |
Less – Accumulated depreciation |  |  | (68,218 | ) |  |  | (65,220 | )
Total |  | $ | 23,205 |  |  | $ | 22,850 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communications Systems |  |  | Total |
Balance – January 1, 2021 |  | $ | 15,525 |  |  | $ | 11,493 |  |  | $ | 27,018 |
Acquisition of Excell |  |  | 11,019 |  |  |  | - |  |  |  | 11,019 |
Effect of foreign currency translation |  |  | 31 |  |  |  | - |  |  |  | 31 |
Balance – December 31, 2021 |  | $ | 26,575 |  |  | $ | 11,493 |  |  | $ | 38,068 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 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 |
|  | December 31, 2020, |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Customer relationships |  | $ | 9,171 |  |  | $ | 5,115 |  |  | $ | 4,056 |
Patents and technology |  |  | 5,557 |  |  |  | 5,014 |  |  |  | 543 |
Trade name |  |  | 1,524 |  |  |  | 324 |  |  |  | 1,200 |
Trademarks |  |  | 3,410 |  |  |  | - |  |  |  | 3,410 |
Total other intangible assets |  | $ | 19,662 |  |  | $ | 10,453 |  |  | $ | 9,209 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |
Research and development expense |  | $ | 118 |  |  | $ | 124 |
Selling, general and administrative expense |  |  | 515 |  |  |  | 471 |
Total |  | $ | 633 |  |  | $ | 595 |

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