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Note 4 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 201 6 |  |  | 201 5 |
Raw Materials |  | $ | 14,482 |  |  | $ | 11,602 |
Work in Process |  |  | 986 |  |  |  | 1,560 |
Finished Products |  |  | 7,988 |  |  |  | 10,652 |
Total |  | $ | 23,456 |  |  | $ | 23,814 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 201 6 |  |  | 201 5 |
Land |  | $ | 123 |  |  | $ | 123 |
Buildings and Leasehold Improvements |  |  | 7,757 |  |  |  | 7,490 |
Machinery and Equipment |  |  | 49,722 |  |  |  | 49,609 |
Furniture and Fixtures |  |  | 1,947 |  |  |  | 1,974 |
Computer Hardware and Software |  |  | 5,223 |  |  |  | 4,585 |
Construction in Progress |  |  | 421 |  |  |  | 745 |
|  |  | 65,193 |  |  |  | 64,526 |
Less – Accumulated Depreciation |  |  | (57,194 | ) |  |  | (55,488 | )
Total |  | $ | 7,999 |  |  | $ | 9,038 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communi- cations Systems |  |  | Total |
Balance – January 1, 2015 |  | $ | 4,914 |  |  | $ | 11,493 |  |  | $ | 16,407 |
Effect of Foreign Currency Translation |  |  | (124 | ) |  |  | - |  |  |  | (124 | )
Balance – December 31, 2015 |  |  | 4,790 |  |  |  | 11,493 |  |  |  | 16,283 |
Acquisition of Accutronics |  |  | 4,487 |  |  |  | - |  |  |  | 4,487 |
Effect of Foreign Currency Translation |  |  | (805 | ) |  |  | - |  |  |  | (805 | )
Balance – December 31, 2016 |  | $ | 8,472 |  |  | $ | 11,493 |  |  | $ | 19,965 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 201 6 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Trademarks |  | $ | 3,404 |  |  | $ | - |  |  | $ | 3,404 |
Customer Relationships |  |  | 6,395 |  |  |  | 3,975 |  |  |  | 2,420 |
Patents and Technology |  |  | 5,455 |  |  |  | 4,417 |  |  |  | 1,038 |
Distributor Relationships |  |  | 377 |  |  |  | 368 |  |  |  | 9 |
Trade Name |  |  | 359 |  |  |  | 36 |  |  |  | 323 |
Total Other Intangible Assets |  | $ | 15,990 |  |  | $ | 8,796 |  |  | $ | 7,194 |
|  | December 31, 201 5 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Trademarks |  | $ | 3,411 |  |  | $ | - |  |  | $ | 3,411 |
Patents and Technology |  |  | 4,482 |  |  |  | 4,217 |  |  |  | 265 |
Customer Relationships |  |  | 3,971 |  |  |  | 3,716 |  |  |  | 255 |
Distributor Relationships |  |  | 370 |  |  |  | 355 |  |  |  | 15 |
Total Other Intangible Assets |  | $ | 12,234 |  |  | $ | 8,288 |  |  | $ | 3,946 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] |
|  | Year ended December 31, |
|  | 201 6 |  |  | 201 5 |
Research and Development Expense |  | $ | 200 |  |  | $ | 130 |
Selling, General and Administrative Expense |  |  | 303 |  |  |  | 105 |
Total |  | $ | 503 |  |  | $ | 235 |

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