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Note 3 - Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,806 | $ 4,802
Accumulated Amortization | (2,392) | (2,140)
Net Carrying Amount | 2,414 | 2,662
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 512 | 512
Accumulated Amortization | (186) | (168)
Net Carrying Amount | $ 326 | 344
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives (Years) | 3 years |
Gross Carrying Amount | $ 379 | 375
Accumulated Amortization | (358) | (319)
Net Carrying Amount | $ 21 | 56
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives (Years) | 12 years |
Gross Carrying Amount | $ 3,370 | 3,370
Accumulated Amortization | (1,503) | (1,335)
Net Carrying Amount | $ 1,867 | 2,035
Permits [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives (Years) | 10 years |
Gross Carrying Amount | $ 545 | 545
Accumulated Amortization | (345) | (318)
Net Carrying Amount | $ 200 | $ 227
Minimum [Member] | Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives (Years) | 8 years |
Maximum [Member] | Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives (Years) | 18 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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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=26713463&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=26713463&loc=d3e16323-109275 + Details
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- 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=26713463&loc=d3e16323-109275 + Details
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