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Note 3 - Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure Text Block Supplement [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31, |
|  | 2013 |  |  | 2012 |
Raw materials |  | $ | 16,239 |  |  | $ | 15,023 |
Work in process |  |  | 2,412 |  |  |  | 4,863 |
Finished products |  |  | 7,402 |  |  |  | 10,484 |
|  | $ | 26,053 |  |  | $ | 30,370 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2013 |  |  | 2012 |
Land |  | $ | 123 |  |  | $ | 123 |
Buildings and Leasehold Improvements |  |  | 7,412 |  |  |  | 7,381 |
Machinery and Equipment |  |  | 47,405 |  |  |  | 46,606 |
Furniture and Fixtures |  |  | 1,866 |  |  |  | 1,810 |
Computer Hardware and Software |  |  | 4,247 |  |  |  | 4,103 |
Construction in Progress |  |  | 1,073 |  |  |  | 1,275 |
|  |  | 62,126 |  |  |  | 61,298 |
Less: Accumulated Depreciation |  |  | 51,924 |  |  |  | 48,883 |
|  | $ | 10,202 |  |  | $ | 12,415 |
Schedule of Goodwill [Table Text Block] |
|  | Battery & Energy Products |  |  | Communications Systems |  |  | Discontinued Operations |  |  | Total |
Balance at December 31, 2011 |  | $ | 4,838 |  |  | $ | 11,493 |  |  | $ | 2,025 |  |  | $ | 18,356 |
Sale of RedBlack Communications |  |  |  |  |  |  |  |  |  |  | (2,025 | ) |  |  | (2,025 | )
Effect of foreign currency translations |  |  | 13 |  |  |  | - |  |  |  | - |  |  |  | 13 |
Balance at December 31, 2012 |  | $ | 4,851 |  |  | $ | 11,493 |  |  | $ | - |  |  | $ | 16,344 |
Effect of foreign currency translations |  |  | 75 |  |  |  | - |  |  |  | - |  |  |  | 75 |
Balance at December 31, 2013 |  | $ | 4,926 |  |  | $ | 11,493 |  |  | $ | - |  |  | $ | 16,419 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31, 2013 |
|  | Gross Assets |  |  | Accumulated Amortization |  |  | Net |
Trademarks |  | $ | 3,568 |  |  | $ | - |  |  | $ | 3,568 |
Patents and technology |  |  | 4,511 |  |  |  | 3,941 |  |  |  | 570 |
Customer relationships |  |  | 4,033 |  |  |  | 3,562 |  |  |  | 471 |
Distributor relationships |  |  | 393 |  |  |  | 356 |  |  |  | 37 |
Non-compete agreements |  |  | 218 |  |  |  | 218 |  |  |  | - |
Total intangible assets |  | $ | 12,723 |  |  | $ | 8,077 |  |  | $ | 4,646 |
|  | December 31, 2012 |
|  | Gross Assets |  |  | Accumulated Amortization |  |  | Net |
Trademarks |  | $ | 3,564 |  |  | $ | - |  |  | $ | 3,564 |
Patents and technology |  |  | 4,495 |  |  |  | 3,702 |  |  |  | 793 |
Customer relationships |  |  | 3,998 |  |  |  | 3,366 |  |  |  | 632 |
Distributor relationships |  |  | 380 |  |  |  | 330 |  |  |  | 50 |
Non-compete agreements |  |  | 217 |  |  |  | 217 |  |  |  | - |
Total intangible assets |  | $ | 12,654 |  |  | $ | 7,615 |  |  | $ | 5,039 |

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