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Note 5 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Cash |  | $ | 10,562 |  |  | $ | 7,135 |
Restricted cash |  |  | 91 |  |  |  | 270 |
Total |  | $ | 10,653 |  |  | $ | 7,405 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Raw materials |  | $ | 17,277 |  |  | $ | 18,485 |
Work in process |  |  | 3,411 |  |  |  | 2,548 |
Finished products |  |  | 7,505 |  |  |  | 8,726 |
Total |  | $ | 28,193 |  |  | $ | 29,759 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Land |  | $ | 1,273 |  |  | $ | 1,273 |
Buildings and leasehold improvements |  |  | 15,393 |  |  |  | 15,386 |
Machinery and equipment |  |  | 61,048 |  |  |  | 55,058 |
Furniture and fixtures |  |  | 2,235 |  |  |  | 2,194 |
Computer hardware and software |  |  | 6,894 |  |  |  | 6,712 |
Construction in progress |  |  | 1,227 |  |  |  | 4,730 |
|  |  | 88,070 |  |  |  | 85,353 |
Less – Accumulated depreciation |  |  | (65,220 | ) |  |  | (62,828 | )
Total |  | $ | 22,850 |  |  | $ | 22,525 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communications Systems |  |  | Total |
Balance – January 1, 2019 |  | $ | 8,616 |  |  | $ | 11,493 |  |  | $ | 20,109 |
Acquisition of SWE |  |  | 6,534 |  |  |  | - |  |  |  | 6,534 |
Effect of foreign currency translation |  |  | 110 |  |  |  | - |  |  |  | 110 |
Balance – December 31, 2019 |  |  | 15,260 |  |  |  | 11,493 |  |  |  | 26,753 |
Effect of foreign currency translation |  |  | 265 |  |  |  | - |  |  |  | 265 |
Balance – December 31, 2020 |  | $ | 15,525 |  |  | $ | 11,493 |  |  | $ | 27,018 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2020, |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Trademarks |  | $ | 3,410 |  |  | $ | - |  |  | $ | 3,410 |
Customer relationships |  |  | 9,171 |  |  |  | 5,115 |  |  |  | 4,056 |
Patents and technology |  |  | 5,557 |  |  |  | 5,014 |  |  |  | 543 |
Distributor relationships |  |  | 377 |  |  |  | 377 |  |  |  | 0 |
Trade name |  |  | 1,524 |  |  |  | 324 |  |  |  | 1,200 |
Total other intangible assets |  | $ | 20,039 |  |  | $ | 10,830 |  |  | $ | 9,209 |
|  | December 31, 2019, |
|  | Cost |  |  | Accumulated amortization |  |  | Net |
Trademarks |  | $ | 3,403 |  |  | $ | - |  |  | $ | 3,403 |
Customer relationships |  |  | 9,080 |  |  |  | 4,721 |  |  |  | 4,359 |
Patents and technology |  |  | 5,521 |  |  |  | 4,869 |  |  |  | 652 |
Distributor relationships |  |  | 377 |  |  |  | 377 |  |  |  | - |
Trade name |  |  | 1,511 |  |  |  | 204 |  |  |  | 1,307 |
Total other intangible assets |  | $ | 19,892 |  |  | $ | 10,171 |  |  | $ | 9,721 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 2020 |  |  | 2019 |
Research and development expense |  | $ | 124 |  |  | $ | 130 |
Selling, general and administrative expense |  |  | 471 |  |  |  | 395 |
Total |  | $ | 595 |  |  | $ | 525 |

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