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Note 6 - Supplemental Balance Sheet Information (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Cash |  | $ | 6,528 |  |  | $ | 25,583 |
Restricted cash |  |  | 288 |  |  |  | 351 |
Total |  | $ | 6,816 |  |  | $ | 25,934 |
Schedule of Inventory, Current [Table Text Block] |
|  | June 30, |  |  | December 31 , |
|  | 2019 |  |  | 2018 |
Raw materials |  | $ | 18,379 |  |  | $ | 13,274 |
Work in process |  |  | 2,679 |  |  |  | 2,016 |
Finished goods |  |  | 13,257 |  |  |  | 7,553 |
Total |  | $ | 34,315 |  |  | $ | 22,843 |
Property, Plant and Equipment [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 201 9 |  |  | 201 8 |
Land |  | $ | 1,273 |  |  | $ | 123 |
Buildings and leasehold improvements |  |  | 15,285 |  |  |  | 8,267 |
Machinery and equipment |  |  | 53,774 |  |  |  | 51,261 |
Furniture and fixtures |  |  | 2,177 |  |  |  | 2,058 |
Computer hardware and software |  |  | 6,120 |  |  |  | 5,590 |
Construction in process |  |  | 5,036 |  |  |  | 4,302 |
|  |  | 83,665 |  |  |  | 71,601 |
Less: Accumulated depreciation |  |  | (61,587 | ) |  |  | (60,857 | )
Property, equipment and improvements, net |  | $ | 22,078 |  |  | $ | 10,744 |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | July 1, |  |  | June 30, |  |  | July 1, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Depreciation expense |  | $ | 515 |  |  | $ | 496 |  |  | $ | 962 |  |  | $ | 980 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy |  |  | Communi- cations |  |  |  |  |
|  | Products |  |  | Systems |  |  | Total |
Balance - December 31, 2017 |  | $ | 8,965 |  |  | $ | 11,493 |  |  | $ | 20,458 |
Effect of foreign currency translation |  |  | (136 | ) |  |  | - |  |  |  | (136 | )
Balance – July 1, 2018 |  |  | 8,829 |  |  |  | 11,493 |  |  |  | 20,322 |
Effect of foreign currency translation |  |  | (213 | ) |  |  | - |  |  |  | (213 | )
Balance - December 31, 2018 |  |  | 8,616 |  |  |  | 11,493 |  |  |  | 20,109 |
Acquisition of SWE |  |  | 6,474 |  |  |  | - |  |  |  | 6,474 |
Effect of foreign currency translation |  |  | (9 | ) |  |  | - |  |  |  | (9 | )
Balance – June 30, 2019 |  | $ | 15,081 |  |  | $ | 11,493 |  |  | $ | 26,574 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | at June 30 , 2019 |
|  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Net |
Trademarks |  | $ | 3,405 |  |  | $ | - |  |  | $ | 3,405 |
Customer relationships |  |  | 8,986 |  |  |  | 4,509 |  |  |  | 4,477 |
Patents and technology |  |  | 5,483 |  |  |  | 4,789 |  |  |  | 694 |
Distributor relationships |  |  | 377 |  |  |  | 377 |  |  |  | - |
Trade name |  |  | 1,497 |  |  |  | 141 |  |  |  | 1,356 |
Total |  | $ | 19,748 |  |  | $ | 9,816 |  |  | $ | 9,932 |
|  | at December 31, 201 8 |
|  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | 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 |  | $ | 16,109 |  |  | $ | 9,605 |  |  | $ | 6,504 |
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Annual |
|  |  |  |  |  | Estimated |  |  | Estimated |
|  | Estimated Fair |  |  | Useful Lives |  |  | Amortization |
|  | Value |  |  | in Years |  |  | Expense |
Customer relationships |  | $ | 2,522 |  |  |  | 15 |  |  | $ | 168 |
Trade name |  |  | 1,127 |  |  |  | 15 |  |  |  | 75 |
Total |  | $ | 3,649 |  |  |  |  |  |  | $ | 243 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | July 1, |  |  | June 30, |  |  | July 1, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Amortization included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  | $ | 33 |  |  | $ | 37 |  |  | $ | 66 |  |  | $ | 75 |
Selling, general and administrative |  |  | 99 |  |  |  | 64 |  |  |  | 158 |  |  |  | 128 |
Total amortization expense |  | $ | 132 |  |  | $ | 101 |  |  | $ | 224 |  |  | $ | 203 |

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