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Note 5 - Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 5. Property and Equipment Major classifications of property and equipment and estimated useful lives were as follows:
|  | Estimated useful lives |  |  | As of December 31, |
|  | in years |  |  | 2017 |  |  | 2016 |
Office furniture and equipment |  |  | 3 | to | 10 |  |  | $ | 4,904 |  |  | $ | 4,835 |
Leasehold improvements |  |  | 1 | to | 6 |  |  |  | 1,509 |  |  |  | 1,495 |
Vehicles |  |  | 5 | to | 10 |  |  |  | 160 |  |  |  | - |
Manufacturing and test equipment |  |  | 2 | to | 10 |  |  |  | 2,577 |  |  |  | 2,537 |
|  |  |  |  |  |  |  |  | 9,150 |  |  |  | 8,867 |
Accumulated depreciation and amortization |  |  |  |  |  |  |  |  | (7,601 | ) |  |  | (7,354 | )
Property and equipment, net |  |  |  |  |  |  |  | $ | 1,549 |  |  | $ | 1,513 |
Depreciation expense on property and equipment for the years ended December 31, 2017, 2016 and 2015 was $599, $723, and $801, respectively. During the twelve months ended December 31, 2017 we recorded $128 thousand for the disposal of fixed assets consisting of software, manufacturing equipment and furniture.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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