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Note 5 - Other Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Intangible Assets Disclosure [Text Block] |
| ( 5 ) | Other Intangible Assets
The carrying values of the Company’s definite-lived intangible assets as of December 31, 2017 and 2016 are as follows (in thousands):
|  | Patents |  | Non- Compete |  | Customer List |  | Total
Estimated useful life (in years) |  |  | 14 |  |  |  | 5 |  |  |  | 5 |  |  |  |  |
Gross amount at December 31, 2017 |  | $ | 429 |  |  | $ | 512 |  |  | $ | 2,046 |  |  | $ | 2,987 |
Accumulated amortization at December 31, 2017 |  |  | (429 | ) |  |  | (512 | ) |  |  | (2,046 | ) |  | $ | (2,987 | )
Net balance at December 31, 2017 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Gross amount at December 31, 2016 |  | $ | 429 |  |  | $ | 512 |  |  | $ | 2,046 |  |  | $ | 2,987 |
Accumulated amortization at December 31, 2016 |  |  | (429 | ) |  |  | (449 | ) |  |  | (1,791 | ) |  |  | (2,669 | )
Net balance at December 31, 2016 |  | $ | - |  |  | $ | 63 |  |  | $ | 255 |  |  | $ | 318 |
Amortization expense related to intangible assets was approximately $318,000 for each of the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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