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Note 3 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Cash |  | $ | 25,583 |  |  | $ | 18,241 |
Restricted Cash |  |  | 351 |  |  |  | 89 |
Total |  | $ | 25,934 |  |  | $ | 18,330 |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 2018 |  |  | 2017 |
Raw Materials |  | $ | 13,274 |  |  | $ | 14,606 |
Work in Process |  |  | 2,016 |  |  |  | 2,013 |
Finished Products |  |  | 7,553 |  |  |  | 9,707 |
Total |  | $ | 22,843 |  |  | $ | 26,326 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2018 |  |  | 2017 |
Land |  | $ | 123 |  |  | $ | 123 |
Buildings and Leasehold Improvements |  |  | 8,267 |  |  |  | 7,858 |
Machinery and Equipment |  |  | 51,261 |  |  |  | 50,852 |
Furniture and Fixtures |  |  | 2,058 |  |  |  | 2,005 |
Computer Hardware and Software |  |  | 5,590 |  |  |  | 5,338 |
Construction in Progress |  |  | 4,302 |  |  |  | 535 |
|  |  | 71,601 |  |  |  | 66,711 |
Less – Accumulated Depreciation |  |  | (60,857 | ) |  |  | (59,141 | )
Total |  | $ | 10,744 |  |  | $ | 7,570 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communi- cations Systems |  |  | Total |
Balance – January 1, 2017 |  | $ | 8,472 |  |  | $ | 11,493 |  |  | $ | 19,965 |
Effect of Foreign Currency Translation |  |  | 493 |  |  |  | - |  |  |  | 493 |
Balance – December 31, 2017 |  |  | 8,965 |  |  |  | 11,493 |  |  |  | 20,458 |
Effect of Foreign Currency Translation |  |  | (349 | ) |  |  | - |  |  |  | (349 | )
Balance – December 31, 2018 |  | $ | 8,616 |  |  | $ | 11,493 |  |  | $ | 20,109 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2018 |
|  | Cost |  |  | Accumulated 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 Other Intangible Assets |  | $ | 16,109 |  |  | $ | 9,605 |  |  | $ | 6,504 |
|  | December 31, 2017 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Trademarks |  | $ | 3,411 |  |  | $ | - |  |  | $ | 3,411 |
Customer Relationships |  |  | 6,618 |  |  |  | 4,208 |  |  |  | 2,410 |
Patents and Technology |  |  | 5,545 |  |  |  | 4,595 |  |  |  | 950 |
Distributor Relationships |  |  | 377 |  |  |  | 377 |  |  |  | - |
Trade Name |  |  | 393 |  |  |  | 79 |  |  |  | 314 |
Total Other Intangible Assets |  | $ | 16,344 |  |  | $ | 9,259 |  |  | $ | 7,085 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |
Research and Development Expense |  | $ | 147 |  |  | $ | 165 |
Selling, General and Administrative Expense |  |  | 250 |  |  |  | 257 |
Total |  | $ | 397 |  |  | $ | 422 |

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