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Note 5 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31 |
|  | 201 9 |  |  | 201 8 |
Cash |  | $ | 7,135 |  |  | $ | 25,583 |
Restricted cash |  |  | 270 |  |  |  | 351 |
Total |  | $ | 7,405 |  |  | $ | 25,934 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31 |
|  | 2019 |  |  | 2018 |
Raw materials |  | $ | 18,485 |  |  | $ | 13,274 |
Work in process |  |  | 2,548 |  |  |  | 2,016 |
Finished products |  |  | 8,726 |  |  |  | 7,553 |
Total |  | $ | 29,759 |  |  | $ | 22,843 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31 |
|  | 2019 |  |  | 2018 |
Land |  | $ | 1,273 |  |  | $ | 123 |
Buildings and leasehold improvements |  |  | 8,148 |  |  |  | 8,267 |
Machinery and equipment |  |  | 62,562 |  |  |  | 51,261 |
Furniture and fixtures |  |  | 2,112 |  |  |  | 2,058 |
Computer hardware and software |  |  | 6,528 |  |  |  | 5,590 |
Construction in progress |  |  | 4,730 |  |  |  | 4,302 |
|  |  | 85,353 |  |  |  | 71,601 |
Less – Accumulated depreciation |  |  | (62,828 | ) |  |  | (60,857 | )
Total |  | $ | 22,525 |  |  | $ | 10,744 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communications Systems |  |  | Total |
Balance – January 1, 2018 |  | $ | 8,965 |  |  | $ | 11,493 |  |  | $ | 20,458 |
Effect of foreign currency translation |  |  | (349 | ) |  |  | - |  |  |  | (349 | )
Balance – December 31, 2018 |  |  | 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 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 201 9 |
|  | 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 |
|  | December 31, 201 8 |
|  | Cost |  |  | Accumulated a mortization |  |  | Net |
Trademarks |  | $ | 3,405 |  |  | $ | - |  |  | $ | 3,405 |
Customer relationships |  |  | 6,471 |  |  |  | 4,392 |  |  |  | 2,079 |
Patents and technology |  |  | 5,486 |  |  |  | 4,725 |  |  |  | 761 |
Distributor relationships |  |  | 377 |  |  |  | 377 |  |  |  | - |
Trade name |  |  | 370 |  |  |  | 111 |  |  |  | 259 |
Total other intangible assets |  | $ | 16,109 |  |  | $ | 9,605 |  |  | $ | 6,504 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31 |
|  | 201 9 |  |  | 2018 |
Research and development expense |  | $ | 130 |  |  | $ | 147 |
Selling, general and administrative expense |  |  | 395 |  |  |  | 250 |
Total |  | $ | 525 |  |  | $ | 397 |

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