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Note 5 - Supplemental Balance Sheet Information (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2022
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Cash |  | $ | 5,037 |  |  | $ | 8,329 |
Restricted cash |  |  | 77 |  |  |  | 84 |
Total |  | $ | 5,114 |  |  | $ | 8,413 |
Schedule of Inventory, Current [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Raw materials |  | $ | 26,209 |  |  | $ | 21,660 |
Work in process |  |  | 3,526 |  |  |  | 4,227 |
Finished goods |  |  | 9,466 |  |  |  | 7,302 |
Total |  | $ | 39,201 |  |  | $ | 33,189 |
Property, Plant and Equipment [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Land |  | $ | 1,273 |  |  | $ | 1,273 |
Buildings and leasehold improvements |  |  | 15,522 |  |  |  | 15,442 |
Machinery and equipment |  |  | 63,930 |  |  |  | 63,780 |
Furniture and fixtures |  |  | 2,756 |  |  |  | 2,588 |
Computer hardware and software |  |  | 7,583 |  |  |  | 7,579 |
Construction in process |  |  | 824 |  |  |  | 761 |
|  |  | 91,888 |  |  |  | 91,423 |
Less: Accumulated depreciation |  |  | (69,550 | ) |  |  | (68,218 | )
Property, plant and equipment, net |  | $ | 22,338 |  |  | $ | 23,205 |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Depreciation expense |  | $ | 819 |  |  | $ | 730 |  |  | $ | 1,635 |  |  | $ | 1,460 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy |  |  | Communications |  |  |  |  |
|  | Products |  |  | Systems |  |  | Total |
Balance – December 31, 2021 |  | $ | 26,575 |  |  | $ | 11,493 |  |  | $ | 38,068 |
Measurement period adjustment (1) |  |  | (30 | ) |  |  | - |  |  |  | (30 | )
Effect of foreign currency translation |  |  | (536 | ) |  |  | - |  |  |  | (536 | )
Balance – June 30, 2022 |  | $ | 26,009 |  |  | $ | 11,493 |  |  | $ | 37,502 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | at June 30, 2022 |
|  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Net |
Customer relationships |  | $ | 12,978 |  |  | $ | 5,689 |  |  | $ | 7,289 |
Patents and technology |  |  | 5,560 |  |  |  | 5,117 |  |  |  | 443 |
Trade names |  |  | 4,631 |  |  |  | 468 |  |  |  | 4,163 |
Trademarks |  |  | 3,407 |  |  |  | - |  |  |  | 3,407 |
Other |  |  | 1,500 |  |  |  | 236 |  |  |  | 1,264 |
Total other intangible assets |  | $ | 28,076 |  |  | $ | 11,510 |  |  | $ | 16,566 |
|  | at December 31, 2021 |
|  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | 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] |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Amortization included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  | $ | 25 |  |  | $ | 33 |  |  | $ | 51 |  |  | $ | 66 |
Selling, general and administrative |  |  | 298 |  |  |  | 123 |  |  |  | 600 |  |  |  | 244 |
Total amortization expense |  | $ | 323 |  |  | $ | 156 |  |  |  | 651 |  |  | $ | 310 |

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