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Note 8 - Leases (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Operating Lease, Right-of-Use Asset, Periodic Reduction | $ 391 | $ 329 | $ 782 | $ 638 |
Operating Lease, Right-of-Use Asset | $ 5,177 |  | 5,177 |  | $ 5,770
Increase (Decrease) in Operating Lease Liability |  |  | $ (849) | $ (701) |
Environmental Technologies in Germany [Member] |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) | 25 months |  | 25 months |  |
Operating Lease, Right-of-Use Asset | $ 90 |  | $ 90 |  |
Increase (Decrease) in Operating Lease Liability |  |  | $ 90 |  |
Process Technologies [Member] | Automobile Lease, One [Member] |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) | 36 months |  | 36 months |  |
Process Technologies [Member] | Automobile Lease, Two [Member] |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) | 48 months |  | 48 months |  |
Process Technologies [Member] | Automobile Leases [Member] |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 71 |  | $ 71 |  |
Increase (Decrease) in Operating Lease Liability |  |  | $ 71 |  |

X
- Definition Amount of increase (decrease) in obligation for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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