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Note 4 - Other Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Patents [Member] | Minimum [Member] |  |
Useful Lives | 8 years |
Patents [Member] | Maximum [Member] |  |
Useful Lives | 18 years |
Patents [Member] |  |
Gross Carrying Amount | $ 566 | $ 539
Accumulated Amortization | (259) | (203)
Net Carrying Amount | $ 307 | 336
Computer Software, Intangible Asset [Member] |  |
Useful Lives | 3 years |
Gross Carrying Amount | $ 395 | 395
Accumulated Amortization | (370) | (364)
Net Carrying Amount | $ 25 | 31
Customer Relationships [Member] |  |
Useful Lives | 12 years |
Gross Carrying Amount | $ 3,370 | 3,370
Accumulated Amortization | (1,822) | (1,671)
Net Carrying Amount | $ 1,548 | 1,699
Permits [Member] |  |
Useful Lives | 10 years |
Gross Carrying Amount | $ 545 | 545
Accumulated Amortization | (400) | (373)
Net Carrying Amount | 145 | 172
Gross Carrying Amount | 4,876 | 4,849
Accumulated Amortization | (2,851) | (2,611)
Net Carrying Amount | $ 2,025 | $ 2,238

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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Data Type: | xbrli:durationItemType
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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Period Type: | instant

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 Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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- Details
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Namespace Prefix: |
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- Details
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X
- Details
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