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Note 3 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Gross Carrying Amount | $ 4,911 | $ 4,897
Accumulated Amortization | (3,248) | (3,059)
Net Carrying Amount | 1,663 | 1,838
Patents [Member] |  |
Gross Carrying Amount | 591 | 577
Accumulated Amortization | (290) | (274)
Net Carrying Amount | $ 301 | 303
Patents [Member] | Minimum [Member] |  |
Useful Lives (Year) | 3 years |
Patents [Member] | Maximum [Member] |  |
Useful Lives (Year) | 17 years |
Computer Software, Intangible Asset [Member] |  |
Gross Carrying Amount | $ 405 | 405
Accumulated Amortization | (393) | (383)
Net Carrying Amount | $ 12 | 22
Useful Lives (Year) | 3 years |
Customer Relationships [Member] |  |
Gross Carrying Amount | $ 3,370 | 3,370
Accumulated Amortization | (2,110) | (1,974)
Net Carrying Amount | $ 1,260 | 1,396
Useful Lives (Year) | 12 years |
Permits [Member] |  |
Gross Carrying Amount | $ 545 | 545
Accumulated Amortization | (455) | (428)
Net Carrying Amount | $ 90 | $ 117
Useful Lives (Year) | 10 years |

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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X
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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X
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Details
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- Details
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- Details
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- Details
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