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Note 4 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 201 7 |  |  | 201 6 |
Raw M aterials |  | $ | 14,606 |  |  | $ | 14,482 |
Work in P rocess |  |  | 2,013 |  |  |  | 986 |
Finished P roducts |  |  | 9,707 |  |  |  | 7,988 |
Total |  | $ | 26,326 |  |  | $ | 23,456 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 201 7 |  |  | 201 6 |
Land |  | $ | 123 |  |  | $ | 123 |
Buildings and Leasehold I mprovements |  |  | 7,858 |  |  |  | 7,757 |
Machinery and E quipment |  |  | 50,852 |  |  |  | 49,722 |
Furniture and F ixtures |  |  | 2,005 |  |  |  | 1,947 |
Computer Hardware and S oftware |  |  | 5,338 |  |  |  | 5,223 |
Construction in P rogress |  |  | 535 |  |  |  | 421 |
|  |  | 66,711 |  |  |  | 65,193 |
Less – Accumulated Depreciation |  |  | (59,141 | ) |  |  | (57,194 | )
Total |  | $ | 7,570 |  |  | $ | 7,999 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communi- cations Systems |  |  | Total |
Balance – January 1, 2016 |  | $ | 4,790 |  |  | $ | 11,493 |  |  | $ | 16,283 |
Acquisition of Accutronics |  |  | 4,487 |  |  |  | - |  |  |  | 4,487 |
Effect of Foreign Currency T ranslation |  |  | (805 | ) |  |  | - |  |  |  | (805 | )
Balance – December 31, 2016 |  |  | 8,472 |  |  |  | 11,493 |  |  |  | 19,965 |
Effect of Foreign Currency T ranslation |  |  | 493 |  |  |  | - |  |  |  | 493 |
Balance – December 31, 2017 |  | $ | 8,965 |  |  | $ | 11,493 |  |  | $ | 20,458 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 201 7 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Trademarks |  | $ | 3,411 |  |  | $ | - |  |  | $ | 3,411 |
Customer R elationships |  |  | 6,618 |  |  |  | 4,208 |  |  |  | 2,410 |
Patents and T echnology |  |  | 5,545 |  |  |  | 4,595 |  |  |  | 950 |
Distributor R elationships |  |  | 377 |  |  |  | 377 |  |  |  | - |
Trade Name |  |  | 393 |  |  |  | 79 |  |  |  | 314 |
Total Other Intangible A ssets |  | $ | 16,344 |  |  | $ | 9,259 |  |  | $ | 7,085 |
|  | December 31, 201 6 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Trademarks |  | $ | 3,404 |  |  | $ | - |  |  | $ | 3,404 |
Customer R elationships |  |  | 6,395 |  |  |  | 3,975 |  |  |  | 2,420 |
Patents and T echnology |  |  | 5,455 |  |  |  | 4,417 |  |  |  | 1,038 |
Distributor R elationships |  |  | 377 |  |  |  | 368 |  |  |  | 9 |
Trade Name |  |  | 359 |  |  |  | 36 |  |  |  | 323 |
Total Other Intangible A ssets |  | $ | 15,990 |  |  | $ | 8,796 |  |  | $ | 7,194 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 201 7 |  |  | 201 6 |
Research and Development Expense |  | $ | 165 |  |  | $ | 200 |
Selling, General and Administrative E xpense |  |  | 257 |  |  |  | 303 |
Total |  | $ | 422 |  |  | $ | 503 |

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